Dear Alison, Martin, and all

On the last point commented on by Martin:

"4.3-4.7 Perturbed radiation calculations"

I wonder if it is wise to assign a new name every time experiment conditions change.  I would limit names to quantities that are calculated independently by a physics model or that can be measured more-or-less directly using instruments.  A quantity that is obtained by subtraction or by redoing a calculation with altered conditions could be described as being "due to X" where X is whatever condition was changed, but I'm afraid these names will multiply endlessly.

I think it is fine that we include "clear-sky fluxes of radiation" because they are both measured and must be calculated as part of a normal radiation calculation.

I would be unhappy with "temperature_change_due_to_greenhouse_gases" and 'temperature_change_due_to_aerosols" and "temperature_change_due_to_solar_variability", etc. Each of these can be obtained by carefully designed experiments and they do contribute individually to the total temperature change found in a historical run, but it in all cases I think the standard_name (air_temperature, or surface_air_temperature) should identify the quantity.

Similarly, I would leave out "due to ..." in the definitions proposed.   [I realize this is a judgement call about where to draw the line.]

best regards,
Karl



On 5/17/18 2:54 AM, Martin Juckes - UKRI STFC wrote:
Dear Alison,


Thanks .. some answers and comments below. I've copied Yves Balkanski in to 
comment on the dust deposition parameters (4.1-4.2) [Yves, this discussion is 
trying clarify the definition of parameters depdust anf sedustCI, and to define 
appropriate standard names for these variables].


1.1 I’m waiting for some feedback from LS3MIP to clarify intention regarding 
land ice;


1.2 Thanks, frequency_of_lightning_flashes_per_unit_area (m-2 s-1) and propsoed 
definition are good;


2.1 
surface_net_upward_mass_flux_of_methane_due_to_emission_from_wetland_biological_processes
 (kg m-2 s-1) and proposed definition are good;


3 Stratospheric depths: thanks.


4.1-4.2 Dust deposition

I’ve checked the initial request from PMIP and it now looks clear to me that 
the dry aerosol mass flux is wanted for these variables. I’ve copied Yves 
Balkanski in to this discussion, as he specified these parameters for PMIP and 
may wish to comment. For mass budgets of aerosol amounts it makes more sense to 
deal with dry aerosol fluxes, rather than ambient mass which depends on local 
conditions. The definition of “dry aerosol” is, I believe, intended to refer to 
aerosol propoerties applied to aerosol particles which have been dehydrated, 
either physically or conceptually, in order to make the required measurement, 
not to aerosols which are naturally free of moisture in the atmosphere. I 
accept your other suggestions, hence

4.1: 
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_deposition
 (kg m-2 s-1) [depdust]

4.2: 
tendency_of_atmosphere_mass_content_of_insoluble_dust_dry_aerosol_particles_due_to_deposition
 (kg m-2 s-1) [sedustCI]

4.3-4.7 Perturbed radiation calculations

As I understand it, terms or the form radiative flux due to X refer to the result of a perturbed radiation calculation, with other factors, such as atmospheric 
and surface temperature and reflectivity held constant. Hence, the upwelling longwave flux will be unchanged, as you suggest, but not the upwelling shortwave 
flux: the upwelling flux will change when the downwelling flux is modified by changing the radiation calculation. There is a slight problem with the approach 
here, in that the "due_to_X" construction is intended to be used to distinguish contributions from different processes "X", but 
"ambient_aerosol" is not strictly a process: the process is ambient aerosol contributions to the radiative transfer calculations.   In proposing 
these names I stayed with the compact form, which has been used previously, rather than trying to expand to indicate the process itself explicitly in the 
standard name. The questions raised here make me wonder whether we should be more expansive. In the scientific literature the terms "direct effect" 
and "indirect effect" are now well established, with "direct effect" referring to the impact of aerosol on the radiative transfer 
calculation through scattering and absorbtion. The indirect effect refers to other changes caused by aerosol through processes such as cloud seeding. Hence, I 
suggest sticking with the "net_downward" formulation (it is required for shortwave, and using the same approach for longwave looks neater to me), and 
appending "direct_effect":
4.3 
surface_net_downward_longwave_flux_in_air_due_to_ambient_aerosol_direct_effect 
(W m-2)
4.4 
surface_net_downward_longwave_flux_in_air_due_to_dust_ambient_aerosol_direct_effect_assuming_clear_sky
 (W m-2)
4.6 
surface_net_downward_shortwave_flux_in_air_due_to_ambient_aerosol_direct_effect 
(W m-2)
4.7 
surface_net_downward_shortwave_flux_in_air_due_to_dust_ambient_aerosol_direct_effect_assuming_clear_sky
 (W m-2)
Regards,

Martin

________________________________
From: Pamment, Alison (STFC,RAL,RALSP)
Sent: 14 May 2018 16:21
To: Pamment, Alison (STFC,RAL,RALSP); Juckes, Martin (STFC,RAL,RALSP); 
cf-metadata@cgd.ucar.edu
Cc: Jean-Yves Peterschmitt
Subject: RE: PMIP: standard names for the CMIP6 data request: tws, lighning 
flashes, wetland emissions, etc

Dear Martin and Jonathan,

While going through the VolMIP names I realised I had made a mistake in some of 
my suggestions for this group of PMIP names. I suggested 4.3, 4.4, 4.6 and 4.7 
should not be surface_net_downward_fluxes but simply surface_downward ones. If 
we agree on this approach they should actually say downwelling, not downward, 
so they would be
4.3 surface_downwelling_longwave_flux_in_air_due_to_ambient_aerosol (W m-2)
4.4 
surface_downwelling_longwave_flux_in_air_due_to_dust_ambient_aerosol_assuming_clear_sky
 (W m-2)
4.6 surface_downwelling_shortwave_flux_in_air_due_to_ambient_aerosol (W m-2)
4.7 
surface_downwelling_shortwave_flux_in_air_due_to_dust_ambient_aerosol_assuming_clear_sky
 (W m-2)
and the definitions would need to be adjusted accordingly.

Best wishes,
Alison

------
Alison Pamment                                 Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival    Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.

-----Original Message-----
From: CF-metadata <cf-metadata-boun...@cgd.ucar.edu> On Behalf Of Alison 
Pamment - UKRI STFC
Sent: 14 May 2018 08:47
To: Juckes, Martin (STFC,RAL,RALSP) <martin.juc...@stfc.ac.uk>; 
cf-metadata@cgd.ucar.edu
Cc: Jean-Yves Peterschmitt <jean-yves.peterschm...@lsce.ipsl.fr>
Subject: Re: [CF-metadata] PMIP: standard names for the CMIP6 data request: 
tws, lighning flashes, wetland emissions, etc

Dear Martin and Jonathan,

Thank you for proposing this set of names and for the comments received so far. 
The proposals look good - I have accepted a couple that seem straight forward 
and I think we can agree the rest quite quickly. Please have a look through my 
comments on the individual names and let me know what you think.

(1.1) CMIP6 short name mrtws. Terrestrial Water Storage
land_based_water_amount (kg m-2) 'The quantity with standard name
land_based_water_amount, often known as "Terrestrial Water Storage",
includes surface water (water in rivers, wetlands, lakes, snow, vegetation and 
reservoirs) and subsurface water (soil moisture, groundwater).'
Jonathan has suggested land_water_amount for consistency with land_ice names. I agree 
this is a good idea, especially if the term "land water" is already in general 
use. Regarding the definition, it seems we should also include at least some elements of 
land_ice within land_water, but there is a question as to whether this would also include 
floating ice shelves and/or ice sheets.

This name is still under discussion.

(1.2) CMIP6 short name Flashrate. Lightning flash rate cf.
number_of_icebergs_per_unit_area; number_of_observations There are no
standard names for frequency of events, but we can adapt the "number_of_" 
construction.

Proposed name:
frequency_of_lightning_flash_per_unit_area (km-2 s-1) 'A lightning
flash is a compound event, usually consists of several discharges.'
Jonathan has suggested, and Martin has agreed to, 
frequency_of_lightning_flashes_per_unit_area. I agree that name looks fine. I 
think the canonical units should probably by m-2 s-1, and I've added a sentence 
about frequency to the definition:

frequency_of_lightning_flashes_per_unit_area (m-2 s-1) 'A lightning flash is a 
compound event, usually consisting of several discharges. Frequency is the 
number of oscillations of a wave, or the number of occurrences of an event, per 
unit time.'

Is this okay? This name is still under discussion.

2. Wetland parameters
===================

(2.1) wetlandCH4 Grid averaged methane emissions from wetlands
surface_upward_mass_flux_of_methane_due_to_emission_from_wetland_biolo
gical_production is recently approved. In other existing names we have
"biological_processes" to cover production and consumption. The CF
area type table now includes the area type "wetland". This term is
intended to be the sum of the production term described by 
surface_upward_mass_flux_of_methane_due_to_emission_from_wetland_biological_production
 and a consumption term 
(surface_downward_mass_flux_of_methane_due_to_emission_from_wetland_biological_consumption).
Proposed name:
surface_upward_mass_flux_of_methane_due_to_emission_from_wetland_biolo
gical_processes (kg m-2 s-1) 'The emission from biological processes is the net 
emission resulting from combined production and consumption.'
Usually for a net flux, we say that in the name, so this one should be:
surface_net_upward_mass_flux_of_methane_due_to_emission_from_wetland_biological_processes (kg m-2 s-1) ' "Upward" indicates a vector 
component which is positive when directed upward (negative downward). A net upward flux is the difference between the flux from below (upward) and 
the flux from above (downward). In accordance with common usage in geophysical disciplines, "flux" implies per unit area, called "flux 
density" in physics. The chemical formula for methane is CH4. Methane is a member of the group of hydrocarbons known as alkanes. There are 
standard names for the alkane group as well as for some of the individual species. The specification of a physical process by the phrase 
"due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by 
omitting the phrase. "Emission" means emission from a primary source located anywhere within the atmosphere, including at the lower 
boundary (i.e. the surface of the earth). "Emission" is a process entirely distinct from "re-emission" which is used in some 
standard names. W  etlands are areas where water covers the soil, or is present either at or near the surface of the soil all year or for varying 
periods of time during the year, including during the growing season. The precise conditions under which wetlands produce and consume methane can 
vary between models. The quantity with standard name surface_net_upward_mass_flux_of_methane_due_to_emission_from_wetland_biological_processes is the 
difference between the upward and downward surface fluxes of methane which have standard names 
surface_upward_mass_flux_of_methane_due_to_emission_from_wetland_biological_production and 
surface_downward_mass_flux_of_methane_due_to_wetland_biological_consumption, respectively.'

I have adapted the sentence we usually use to describe net radiation to 
describe fluxes instead. We have existing standard names for both the 
production and consumption terms so I have added cross-references to those. The 
rest of the definition was constructed from existing text.

Is this okay? This name is still under discussion.

3. Stratospheric optical depths

Following existing name stratosphere_mole_content_of_nitrogen_dioxide
and
atmosphere_absorption_optical_thickness_due_to_dust_ambient_aerosol_pa
rticles and
atmosphere_optical_thickness_due_to_sulfate_ambient_aerosol_particles

(3.1) CMIP6 short name: od550aerso Stratospheric Optical depth at 550
nm (all aerosols) 2D-field (here we limit the computation of OD to the
stratosphere only)

Proposed name:
stratosphere_optical_thickness_due_to_ambient_aerosol_particles (1)
'The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is 
reduced by a factor exp(-"optical_thickness") on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency 
can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. The stratosphere optical thickness applies to 
radiation passing through the atmosphere layer between the tropopause and stratopause. The specification of a physical process by the phrase 
"due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by 
omitting the phrase. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier 
gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and 
relative hum  idity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient 
water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify 
the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard 
names of "relative_humidity" and "air_temperature".'

The name and units look fine and I have constructed the definition from 
existing text. This name is accepted for publication in the standard name table 
and will be added in the May update.

  (3.2) CMIP6 short name od550so4so. Stratospheric Optical depth at 550
nm (sulphate only) 2D-field (here we limit the computation of OD to
the stratosphere only)

Proposed name:
stratosphere_optical_thickness_due_to_sulfate_ambient_aerosol_particle
s (1)
'The optical thickness is the integral along the path of radiation of a volume scattering/absorption/attenuation coefficient. The radiative flux is 
reduced by a factor exp(-"optical_thickness") on traversing the path. A coordinate variable of radiation_wavelength or radiation_frequency 
can be specified to indicate that the optical thickness applies at specific wavelengths or frequencies. The stratosphere optical thickness applies to 
radiation passing through the atmosphere layer between the tropopause and stratopause. The specification of a physical process by the phrase 
"due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by 
omitting the phrase. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier 
gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and 
relative hum  idity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient 
water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To specify 
the relative humidity and temperature at which the quantity described by the standard name applies, provide scalar coordinate variables with standard 
names of "relative_humidity" and "air_temperature".'

The name and units look fine and I have constructed the definition from 
existing text. This name is accepted for publication in the standard name table 
and will be added in the May update.

4. Dust

Based on
atmosphere_absorption_optical_thickness_due_to_dust_ambient_aerosol_par
ticles

(4.1) CMIP6 short name depdust.  Total Deposition Rate of Dust

Proposed name:
surface_downward_mass_flux_of_dust_ambient_aerosol_particles (kg m-2
s-1) It might make more sense to ask for mass flux of dry aerosols here.
We have the following existing names:
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_dry_deposition
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_gravitational_settling
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_turbulent_deposition
tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_wet_deposition.
Dry_deposition is defined as the sum of gravitational_settling and 
turbulent_deposition. The sum of dry_deposition and wet_deposition is just 
'deposition' which we use in some existing nitrogen_compound names. The 
quantity you are proposing looks to me like it should be the sum of all 
deposition terms and for consistency with the existing names it should be 
expressed as a tendency_of_atmosphere_mass_content. Putting all this together, 
I think the name should be written as:
tendency_of_atmosphere_mass_content_of_dust_ambient_aerosol_particles_due_to_deposition (kg m-2 s-1) 'The phrase "tendency_of_X" means derivative of X with respect to time. 
"Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral from the surface to the top of the atmosphere. For 
the content between specified levels in the atmosphere, standard names including "content_of_atmosphere_layer" are used. The mass is the total mass of the particles. 
"Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the 
aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are 
aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic growth depends on the relative humidity and the composition of the particles. To 
specify the relative humidity and temperature at which the quan  tity described by the standard name applies, provide scalar coordinate variables with standard names of 
"relative_humidity" and "air_temperature". The specification of a physical process by the phrase "due_to_" process means that the quantity named is a single 
term in a sum of terms which together compose the general quantity named by omitting the phrase. "Deposition" is the sum of wet and dry deposition.'

The definition was constructed from existing text.

I note your comment about whether this should be a 'dry' or 'ambient' aerosol 
name - please see my comment on proposal 4.2 which leads me to think this one 
should indeed be 'ambient'.

(4.2) CMIP6 short name sedustCI. Sedimentation Flux of dust mode
coarse insoluble The adjective "coarse" has been left out of the standard name because it 
appears to be implicit in the term "dust".

Proposed name:
surface_downward_mass_flux_of_insoluble_dust_ambient_aerosol_particles
(kg m-2 s-1)
The fact that this one says 'insoluble' makes me think this is what we would 
usually call 'dry_aerosol', i.e. it hasn't (or can't) take up water from the 
atmosphere. That would then suggest that proposal 4.1 is referring to ambient 
aerosol because it doesn't say 'insoluble'. Do others agree with that line of 
reasoning? We have existing names for 'coarse_mode' aerosol particles, defined 
as having a diameter greater than 1 micrometre, and 'nucleation_mode' aerosol 
particles, defined as having a diameter of less than 3 micrometres. I am not 
expert enough to advise on whether 'dust' would always be considered 'coarse' 
so I don't know whether it's necessary to include that in the name. Again we 
should write the name as a tendency_of_atmosphere_mass_content for consistency 
with existing names. This would lead us to:

tendency_of_atmosphere_mass_content_of_dust_dry_aerosol_particles_due_to_deposition (kg m-2 s-1) 'The phrase "tendency_of_X" means derivative of X 
with respect to time. "Content" indicates a quantity per unit area. The "atmosphere content" of a quantity refers to the vertical integral 
from the surface to the top of the atmosphere. For the content between specified levels in the atmosphere, standard names including 
"content_of_atmosphere_layer" are used. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) 
and their carrier gas, the air itself. Aerosol particles take up ambient water (a process known as hygroscopic growth) depending on the relative humidity and 
the composition of the particles. "Dry aerosol particles" means aerosol particles without any water uptake. The specification of a physical process 
by the phrase "due_to_" process means that the quantity named is a single term in a sum of terms which together compose the general quantity named by 
omitting the phrase. "Deposition" is the sum of wet and dry deposition.'

The definition was constructed from existing text.

Writing the name this way means we then have a pair of names, 4.1 and 4.2, for 
deposition of ambient and dry dust aerosol particles,  respectively. Are these 
okay?

(4.3) CMIP6 short name lwsrfasdust. All-sky Surface Longwave radiative
flux due to Dust

Proposed name:
surface_net_downward_longwave_flux_due_to_dust_ambient_aerosol (W m-2)
If this is a surface flux due to dust, does it make sense to describe it as net 
flux? A net downward flux would be the difference between the downwelling flux 
and the upwelling flux at the surface. I assume that the models don't calculate 
the upwelling flux due solely to dust lying on the ground(!) so I think this 
name should be described simply as a surface_downward flux:
surface_downward_longwave_flux_due_to_ambient_aerosol (W m-2) 'The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a vector 
component which is positive when directed downward (negative upward). The term "longwave" means longwave radiation. In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. The specification of a physical process by the phrase "due_to_" process means that the quantity 
named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Aerosol" means the system of suspended liquid or solid 
particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, 
temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic 
growth. The extent of hygrosc  opic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity 
described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature".'

The definition was constructed from existing text.

Okay?

(4.4) CMIP6 short name lwsrfcsdust. Clear-sky Surface Longwave
radiative flux due to Dust

Proposed name:
surface_net_downward_longwave_flux_due_to_dust_ambient_aerosol_assumin
g_clear_sky (W m-2)
As for proposal 4.3, I think this one should be a downward, rather than net 
downward, flux:
surface_downward_longwave_flux_due_to_dust_ambient_aerosol_assuming_clear_sky (W m-2) 'The surface called "surface" means the lower boundary of the atmosphere. "Downward" 
indicates a vector component which is positive when directed downward (negative upward). The term "longwave" means longwave radiation. In accordance with common usage in geophysical 
disciplines, "flux" implies per unit area, called "flux density" in physics. The specification of a physical process by the phrase "due_to_" process means that the 
quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Aerosol" means the system of suspended liquid or solid particles 
in air (except cloud droplets) and their carrier gas, the air itself."Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and 
relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of 
hygrosco  pic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name 
applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature". A phrase "assuming_condition" indicates that the named 
quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition.'

Okay?

(4.5) CMIP6 short name lwtoacsdust. Clear Sky Longwave Radiative
Forcing due to Dust at TOA

Proposed name:
toa_net_downward_longwave_flux_due_to_dust_ambient_aerosol_assuming_cl
ear_sky (W m-2)
The CMIP6 description says this one is a radiative forcing, rather than a flux. 
Looking at existing names, I see that we have a three that include the term 
'cloud_radiative_effect', e.g. toa_longwave_cloud_radiative_effect, defined as 
longwave cloud radiative forcing. I suggest we follow the pattern of the 
existing names and write this one as:
toa_longwave_dust_ambient_aerosol_particles_radiative_effect (W m-2) ' "toa" means top of atmosphere. The term "longwave" means longwave radiation. 
Dust radiative effect is also commonly known as "dust radiative forcing". It is the difference in radiative flux resulting from the presence of dust aerosol 
particles, i.e. it is the difference between toa_outgoing_longwave_flux_assuming_clear_sky and toa outgoing longwave flux assuming a clear sky (i.e. no clouds) and no 
dust. "Aerosol" means the system of suspended liquid or solid particles in air (except cloud droplets) and their carrier gas, the air itself. 
"Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and relative humidity that exists in its 
immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygroscopic 
growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the q  uantity described by the 
standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature". A phrase 
"assuming_condition" indicates that the named quantity is the value which would obtain if all aspects of the system were unaltered except for the assumption of 
the circumstances specified by the condition.'

Is this okay?

(4.6) CMIP6 short name swsrfasdust. All-sky Surface Shortwave
radiative flux due to Dust

As (4.3), but for shortwave.
To be consistent with 4.3, this one would be:
surface_downward_shortwave_flux_due_to_ambient_aerosol (W m-2) 'The surface called "surface" means the lower boundary of the atmosphere. "Downward" indicates a vector 
component which is positive when directed downward (negative upward). The term "shortwave" means shortwave radiation. In accordance with common usage in geophysical disciplines, 
"flux" implies per unit area, called "flux density" in physics. The specification of a physical process by the phrase "due_to_" process means that the quantity 
named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Aerosol" means the system of suspended liquid or solid 
particles in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, 
temperature and relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic 
growth. The extent of hygro  scopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity 
described by the standard name applies, provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature".'

Okay?

(4.7) CMIP6 short name swsrfcsdust. Clear-sky Surface Shortwave
radiative flux due to Dust

As (4.4), but for shortwave.
To be consistent with 4.4, this one would be:
surface_downward_shortwave_flux_due_to_dust_ambient_aerosol_assuming_clear_sky (W m-2) ' The surface called "surface" means the lower boundary of the atmosphere. "Downward" 
indicates a vector component which is positive when directed downward (negative upward). The term "shortwave" means shortwave radiation. In accordance with common usage in geophysical 
disciplines, "flux" implies per unit area, called "flux density" in physics. The specification of a physical process by the phrase "due_to_" process means that the 
quantity named is a single term in a sum of terms which together compose the general quantity named by omitting the phrase. "Aerosol" means the system of suspended liquid or solid particles 
in air (except cloud droplets) and their carrier gas, the air itself. "Ambient_aerosol" means that the aerosol is measured or modelled at the ambient state of pressure, temperature and 
relative humidity that exists in its immediate environment. "Ambient aerosol particles" are aerosol particles that have taken up ambient water through hygroscopic growth. The extent of hygr 
 oscopic growth depends on the relative humidity and the composition of the particles. To specify the relative humidity and temperature at which the quantity described by the standard name applies, 
provide scalar coordinate variables with standard names of "relative_humidity" and "air_temperature". A phrase "assuming_condition" indicates that the named quantity is 
the value which would obtain if all aspects of the system were unaltered except for the assumption of the circumstances specified by the condition.'

Okay?

Best wishes,
Alison

------
Alison Pamment                                 Tel: +44 1235 778065
NCAS/Centre for Environmental Data Archival    Email: alison.pamm...@stfc.ac.uk
STFC Rutherford Appleton Laboratory
R25, 2.22
Harwell Oxford, Didcot, OX11 0QX, U.K.

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