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Evaluating the diurnal cycle of upper tropospheric humidity in two different climate models using satellite observations
Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Kerala.
EUMETSAT, Darmstadt 64295, Germany; Met Office Hadley Centre, Exeter EX1 3PB, UK.
Meteorological Institute, University of Hamburg, Hamburg 20146, Germany.ORCID iD: 0000-0001-6389-1160
Advanced Centre for Atmospheric Radar Research, Cochin University of Science and Technology, Kerala.
2016 (English)In: Remote Sensing, ISSN 2072-4292, E-ISSN 2072-4292, Vol. 8, no 4, article id 325Article in journal (Refereed) Published
Abstract [en]

The diurnal cycle of upper tropospheric humidity (UTH) is known to be influenced by such processes as convection and the formation of clouds which are parameterized in current global climate models. In this study, we evaluate the performance of two climate models, the Community Atmospheric Model version 5 (CAM-5) and the Global Atmosphere 3.0 (GA-3) model in simulating the diurnal cycle of UTH (represented by a combination of sinusoids of 12 and 24 h periods) by comparing with microwave and infrared (IR) measurements (where available). These comparisons were made over two convective land regions in South America and Africa, and over oceanic regions in the Atlantic, Indian and West Pacific for the month of January 2007. We analyzed how the diurnal cycles from IR and microwave instruments differ, and the reason for the differences. Our study suggests that the differences in the diurnal cycles of IR and microwave UTH result from sampling differences due to the presence of clouds. As noted by earlier studies, the models exhibit considerable discrepancies in diurnal amplitude and phase relative to observations, and these discrepancies have different magnitudes over land and ocean.

Place, publisher, year, edition, pages
MDPI AG. , 2016. Vol. 8, no 4, article id 325
National Category
Aerospace Engineering
Research subject
Space Technology; Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-15680DOI: 10.3390/rs8040325ISI: 000375156500058Scopus ID: 2-s2.0-84971635809Local ID: f387ea02-4d75-4ca4-bfc3-5bba1260c23eOAI: oai:DiVA.org:ltu-15680DiVA, id: diva2:988655
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-04-18Bibliographically approved

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