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Evaluating the diurnal cycle of upper tropospheric humidity in two different climate models using satellite observations
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.ORCID iD: 0000-0001-6389-1160
Hadley Centre, UK MetOffice, Exeter, UK.
2016 (English)In: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202Article in journal (Refereed) Submitted
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. These processes need to be parameterized in global climate models. In this study, we evaluate the performance of the climate models CAM-5 and GA-3 in simulating the diurnal cycle of UTH by taking combined microwave measurements from four different polar orbiting satellites as the reference. 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. In addition to the comparison with microwave data, comparisons with the diurnal cycle generated from IR observations from METEOSAT were done for the African and Atlantic regions. We analyzed how the diurnal cycles from IR and microwave instruments differ, and the reason for these differences. The models exhibit considerable discrepancies in diurnal amplitude and phase relative to the microwave observations, and these discrepancies have different magnitudes over land and ocean. We also confirm that the cloud sensitivity difference is the main reason for the observed differences in the diurnal cycles of IR and microwave UTH.

Place, publisher, year, edition, pages
2016.
National Category
Aerospace Engineering
Research subject
Space Technology; Atmospheric science
Identifiers
URN: urn:nbn:se:ltu:diva-15680Local ID: f387ea02-4d75-4ca4-bfc3-5bba1260c23eOAI: oai:DiVA.org:ltu-15680DiVA: diva2:988655
Note
Upprättat; 2014; 20130222 (ajikot)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-21

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