CMIP6 evaluation of AOD against ground-based observations and MERRA2 ¶

Franziska Hellmuth franziska.hellmuth@geo.uio.no Group 2 Paul Glantz, Ksenia Tabakova, Jonas Gliss My results of Aerosol optical depth will take your breath

Motivation¶


	Fig. 1: Glantz et al.,2014 Climatological seasonal cycles of all‐sky AOT averaged for the Svalbard area (75°N–82°N, 10°W–40°E) in 20 global climate models participating in the CMIP5 project. The climatological cycles are based on the period 1980–2004 of the CMIP5's “historical” experiment. Information on individual models can be found at http://cmip‐pcmdi.llnl.gov/cmip5.

Seasonal variation over Svalbard area
Lowest AOD during summer
CMIP5 against remote sensing
- $\rightarrow$ underestimation during spring
- $\rightarrow$ overestimation during winter

What is the performance of the models in the IPCC CMIP6 project in terms of AOD simulated over - Svalbard region? - Arctic?

Observations, Re-Analysis, historical simulation of CMIP6¶

AERONET (AERosol RObotic NETwork)¶

Sunphotometer at Arctic Station lat > 66 $^{\circ}$ N (total 14)

MERRA2 (Modern-Era Retrospective analysis for Research and Applications 2)¶

satellite reanalysis since 1980
horizontal resolution: 0.5 - 0.625 $^{\circ}$

CMIP6 Models
GFDL-CM4	E3SM-1-0
CanESM5	MIROC-ES2L
NorESM2-LM	CNRM-CM6-1
CESM2-WACCM	IPSL-CM6A-LR
GFDL-ESM4	CESM2

Fig. 2: Sunphotometer and Hornsund Site Manager Piotr Lebkowski. MERRA2 Project. WCRP CMIP6.

Conclusion & Future Work¶

AERONET - MERRA2¶

MERRA2 is higher than AERONET AOD
MERRA2 'stations' compare well to Arctic AOD average

MERRA2 - CMIP6¶

Arctic
- CanESM5 overestimates during spring, too low during summer
- still underestimation during spring
Svalbard region
- CanESM5 within MERRA2 variability

Zonal average¶

overestimation in NH (CanESM5)
overestimation in SH (NorESM2-LM)
$\rightarrow$ compare all models, correlate the ones which fit will $\rightarrow$ Why do they fit better?

Thank you!

CMIP6 evaluation of AOD against ground-based observations and MERRA2 ¶

Motivation¶

Observations, Re-Analysis, historical simulation of CMIP6¶

AERONET (AERosol RObotic NETwork)¶

MERRA2 (Modern-Era Retrospective analysis for Research and Applications 2)¶

Validation of AOD from MERRA2 with AERONET ¶

Evaluation of Arctic AOD from CMIP6 to MERRA2 ¶

AOD evaluation for Svalbard Region ¶

AOD zonal evaluation ¶

Conclusion & Future Work¶

AERONET - MERRA2¶

MERRA2 - CMIP6¶

Zonal average¶