Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen...
-
date post
15-Jan-2016 -
Category
Documents
-
view
223 -
download
0
Transcript of Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen...
![Page 1: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/1.jpg)
Variations in CERES-Terra Fluxes and Cloud Properties with
SST Anomalies
Zach Eitzen (SSAI/NASA-LaRC)
Kuan-Man Xu (NASA-LaRC)
Takmeng Wong (NASA-LaRC)
![Page 2: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/2.jpg)
Acknowledgments
• Thanks to David Doelling and Michele Nordeen for help with CERES cloud property data.
![Page 3: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/3.jpg)
Motivation
• Recent authors (e.g., Wagner et al. (2008, Atmos Chem Phys) have used satellite data to examine cloud properties and their changes with SST anomaly.
• Others (e.g., Bony et al. 2004, Klein and Hartmann 1993, Wood and Bretherton 2006) have studied how clouds change with dynamical regime and lower-tropospheric stability.
• Here, we look at changes in cloud properties with SST anomaly, and attempt to quantify the portion of that change that is due to shifts in stability within a given dynamical regime.
![Page 4: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/4.jpg)
Data Sources• All data is from March 2000-Feb 2005.• Monthly mean 1x1 degree CERES-EBAF data is used
for radiative fluxes.• Monthly mean 1x1 degree CERES Terra SRBAVG Non-
GEO data is used for optical depth and cloud fraction and cloud top height.
• Monthly mean Reynolds SSTs from NOAA.• ECMWF-Interim data is used for meteorological data,
including 700 and Estimated Inversion Strength (EIS).• “Standard” anomalies are calculated by subtracting each
month’s value from the five-year mean for that month. • Residual anomalies of cloud and radiative properties are
calculated by taking the mean anomaly associated with a given (700, EIS) state and subtracting it from the standard anomaly.
![Page 5: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/5.jpg)
Change in total cloud fraction with SST (%/K)
![Page 6: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/6.jpg)
Change in ln(tau) with SST (K-1)
![Page 7: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/7.jpg)
Change in LW CRE with SST (W m-2 K-1)
![Page 8: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/8.jpg)
Change in SW CRE with SST (W m-2 K-1)
![Page 9: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/9.jpg)
Change in Net CRE with SST (W m-2 K-1)
![Page 10: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/10.jpg)
Low cloud regions from Jensen et al. (2008)
![Page 11: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/11.jpg)
Frequency of EIS-700 regimes
![Page 12: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/12.jpg)
Average low cloud anomalies
![Page 13: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/13.jpg)
Joint distribution of low cloud fraction and SST anomalies
![Page 14: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/14.jpg)
Average low cloud ln() anomalies
![Page 15: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/15.jpg)
Average SW CRE anomalies
![Page 16: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/16.jpg)
Average Net CRE anomalies
![Page 17: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/17.jpg)
Changes in properties with SST
Property Slope with standard anomalies
Slope with residual anomalies
Low Cloud Fraction -4.4 % K-1 -1.8 % K-1
Low Cloud ln() -0.103 K-1 -0.049 K-1
LW CRE 1.3 W m-2 K-1 0.5 W m-2 K-1
SW CRE 3.4 W m-2 K-1 2.1 W m-2 K-1
Net CRE 4.7 W m-2 K-1 2.6 W m-2 K-1
![Page 18: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/18.jpg)
Summary• Near the ITCZ, cloud top heights, cloud fraction
and cloud optical depth all increase with SST, leading to little change in net CRE.
• In subtropical boundary-layer cloud regions, cloud fraction and cloud optical depth decrease with SST, leading to less shortwave cooling.
• Changes in cloud and radiative properties with SST have a strong association with changes in EIS within each dynamical regime, but there appears to be a positive cloud feedback even after this is removed.
![Page 19: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/19.jpg)
Future Work• Look at additional fields.
• Filter out months with too much high cloud occurrence.
• Look at individual regions.
![Page 20: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/20.jpg)
Change in cloud top height with SST (km/K)
![Page 21: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/21.jpg)
Frequency of EIS-700 regimes
![Page 22: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/22.jpg)
Average LW CRE anomalies
![Page 23: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/23.jpg)
Joint distribution of low cloud ln() and SST anomalies
![Page 24: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/24.jpg)
Joint distribution of SW CRE and SST anomalies
![Page 25: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/25.jpg)
Joint distribution of LW CRE and SST anomalies
![Page 26: Variations in CERES-Terra Fluxes and Cloud Properties with SST Anomalies Zach Eitzen (SSAI/NASA-LaRC) Kuan-Man Xu (NASA-LaRC) Takmeng Wong (NASA-LaRC)](https://reader036.fdocuments.net/reader036/viewer/2022062322/56649d795503460f94a5c7dc/html5/thumbnails/26.jpg)
Joint distribution of Net CRE and SST anomalies