Global memory analysis in observed and simulated CAPE and CIN


Contact
Kathrin.Riemann-Campe [ at ] awi.de

Abstract

The memory of convective precipitation is estimated via the analysis of the convective parameters convective available potential energy (CAPE) and convective inhibition (CIN). The variability of mixed layer (ML) CAPE and CIN in present‐day climate is presented in terms of a linear decay time scale for short‐term memory and the Hurst exponent for long‐term memory (determined by detrended fluctuation analysis). Regional and global memory in CAPE and CIN is compared between observations (ECMWF re‐analysis, in 1979–2001) and simulated data (ECHAM5/MPIOM, 20C simulation, in 1900–2001). Both datasets agree on the memory pattern in CAPE and CIN with highest values of the Hurst exponent along the equatorial Pacific which decrease towards higher latitudes; however, longest memory up to decades is found in CAPE south‐east of Greenland. The memory in CIN is weaker than in CAPE regarding strength and spatial extent. To determine the origin of memory in CAPE and CIN, ML temperature and specific humidity, enthalpy, and latent heat equivalent of precipitable water (LPW) are analysed. In the tropics the spatial characteristics of the memory in CAPE coincide with memory in LPW, while in the extra‐tropics ML temperature and humidity have the strongest impact.



Item Type
Article
Authors
Divisions
Primary Division
Programs
Primary Topic
Publication Status
Published
Eprint ID
48142
DOI 10.1002/joc.2148

Cite as
Riemann-Campe, K. , Blender, R. and Fraedrich, K. (2011): Global memory analysis in observed and simulated CAPE and CIN , International Journal of Climatology, 31 (8), pp. 1099-1107 . doi: 10.1002/joc.2148


Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email


Citation

Geographical region
N/A

Research Platforms
N/A

Campaigns
N/A


Actions
Edit Item Edit Item