1. generalities - aerocom.met.no · units of the comparisons • sulfate concentration in µg(so...
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1. GENERALITIES
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Parameters available for comparisonOptical properties
OD550_AEROD550D_AER (daily)OD550LT1D_AER (daily)
optical depth at 550 nm for each species fine mode (wet radius <1 um )EC550_AERANGSTROMD_AER (daily)ODMODIS / ODMODISD compa model versus MODIS
ConcentrationsCONC3D_[SO4,BC,OC,SS,DUST]SCONCD _[SO4,BC,OC,SS,DUST] (daily)SCONC _[SO4,BC,OC,SS,DUST] (only for models
without daily concentrations outputs)
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Units of the comparisons
• Sulfate concentration in µg(SO4)/m3
• Organic carbon concentration in µg(OC)/m3
• Black carbon concentration in µgC/m3
• Extinction coefficient in (Mm)-1
* Optical depth : clear sky or all sky
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Types of graphs productedSpecies - Parameter
AERSO4BCOC
DUSTSS
OD550 (D)ANGSTROM (D)
OD550LT1DEC550
SCONC(D)CONC3D
Monthly or daily data
SERIESMAP
SCAT (scatterplot) FIELDCOMPA
Year/Month/Season Station / Region
Use of 3D or surface
conc
Type+ synthesis graphs
STATSCATCOEF
*All graphs exist for WORLD + each region
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Definition of regions
WORLD, LAND, SEA, AFN, AMN, Europe, TropLAND, AsiaS, Band1, Band2, Band3, Band4,OCPACS
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Plots (1)
SERIES : time series model/obs at each station
SCONCD : use of surface daily concentration => Daily filtration+ no mountain sites
CONC3D : use of 3D monthly concentration => interpolation of modeled data to the grid box containing the altitude of the station
INCA EMEP
NAME = ${PARAM}_${SPECIES}_an${year}_mALLYEAR_${station}_SERIES.ps.png
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Plots (2)
MAP : comparison model/obs at each station
INCAOBS
Yearly mean values calculatedat each station
Exists for each region
NAME = ${PARAM}_${SPECIES} _an${year}_mALLYEAR_${region}_MAP.ps.png
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Plots (3)SCAT : scatterplot model versus obs
INCA
OBS
Use of the monthly mean values at each station
Exists for each region+ synthesis of all regions slope
on ALLREGIONS graph
NAME = ${PARAM}_${SPECIES} _an${year}_mALLYEAR_${region}_SCAT.ps.png
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Plots (2)FIELDCOMPA: 2DFIELD + superposition of obs value at each station
Model output + obs at surface
Yearly mean value orExists for each month + seasonal average
Exists for each region
NAME = ${PARAM}_${SPECIES} _an${year}_mALLYEAR_${region}_FIELDCOMPA.ps.png
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Rules for the comparisons
1. Rejection of mountain sites for surface comparison
2. Model outputs interpolated to stations locationshorizontal + vertical for 3D comparisons
3. Daily filtrationDaily data => Model data filtering according to observations
4. Conditions for averagingIf at least 8 days in a month with data => Monthly meanIf at least 4 months in a year with data => Yearly mean
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2. HOW TO SEE THE COMPARISONS ON WEB PAGE
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Choice of subset of measurements (1)
The « Subset » menu allows to restrict the list of stations to the stations with measurements for each considered variable
you see the timeseries plots only for these stations
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Choice of subset of measurements (2)
Example of restrictedlist of stations
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Basics principles for surfobs interface
Standard categories used for any image :[GRAPHTYPE]_[SPECIES]_[PARAMETER]_[REGION]_an[YEAR]_[PERIOD]
Choice of each « category » to see the corresponding graph
SERIESMAPSCAT
FIELDCOMPA
OD550SCONCD
etc…
Regionsor stations whentype = SERIES
AERSO4etc…
mALLYEARor each month : m01, m02, ….., m12or seasonal period : mJFM, mJAS, …
200020019999
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Explicit description of graphs
Choice of « Explicit » lead to only onedescribed image on the page
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Synchronisation of the four graphs
Choice of « Synchron »lead to same choice
of menus for the four graphs(for different models)
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Links to other web pages at the bottom
Links to the data usedfor comparisons
see next slide…
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Measurements are password protected
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All available measurements+ IDL routines
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SYNTHESIS web interfacehttp://nansen.ipsl.jussieu.fr/AEROCOM/DATA/synthesis.html
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NAME = ${PARAM}_${SPECIES} _an${year}_mALLYEAR_ALLREGIONS_STAT.ps.png
Synthesis plots (1)STAT :
comparison of model/obs
statistic values Use of the monthly meanvalues at each station
Use of the monthly meanvalues at each station
Exist for each region
NAME =${PARAM}_${SPECIES} _an${year}_mALLYEAR_${region}_STAT.ps.png
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NAME = ${PARAM}_${SPECIES} _an${year}_mALLYEAR_ALLREGIONS_SURFOBS.ps.png
Synthesis plots (2)SCATCOEF :
comparison of slopeand regression coef
Values of slope and regression obtained from monthly values at each station(obtained from scatterplots)
Exist for each region
NAME =${PARAM}_${SPECIES} _an${year}_mALLYEAR_${region}_SCATCOEF.ps.png