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  Tropical free-tropospheric humidity differences and their effect on the clear-sky radiation budget in global strom-resolving models

Lang, T., Naumann, A. K., Stevens, B., & Buehler, S. (2021). Tropical free-tropospheric humidity differences and their effect on the clear-sky radiation budget in global strom-resolving models. Journal of Advances in Modeling Earth Systems, 13: e2021MS002514. doi:10.1029/2021MS002514.

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2021MS002514.pdf (Publisher version), 2MB
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 Creators:
Lang, Theresa1, 2, Author
Naumann, Ann Kristin1, 3, Author              
Stevens, Bjorn4, Author              
Buehler, Stefan1, Author
Affiliations:
1Meteorological Institute, Center for Earth System Research and Sustainability (CEN), Universität Hamburg, ou_persistent22              
2IMPRS on Earth System Modelling, MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913547              
3Drivers of tropical circulation (CLICCS JWG), The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_3055403              
4Director’s Research Group AES, The Atmosphere in the Earth System, MPI for Meteorology, Max Planck Society, ou_913570              

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 Abstract: Reducing the model spread in free-tropospheric relative humidity (RH) and its response to warming is a crucial step toward reducing the uncertainty in clear-sky climate sensitivity, a step that is hoped to be taken with recently developed global storm-resolving models (GSRMs). In this study we quantify the inter-model differences in tropical present-day RH across GSRMs, making use of DYAMOND, a first 40-day intercomparison. We find that the inter-model spread in tropical mean free-tropospheric RH is reduced compared to conventional atmospheric models, except from the tropopause region and the transition to the boundary layer. We estimate the reduction to ∼50%–70% in the upper troposphere and 25%–50% in the mid troposphere. However, the remaining RH differences still result in a spread of 1.2 urn:x-wiley:19422466:media:jame21474:jame21474-math-0001 in tropical mean clear-sky outgoing longwave radiation (OLR). This spread is mainly caused by RH differences in the lower and mid free troposphere, whereas RH differences in the upper troposphere have a minor impact. By examining model differences in moisture space we identify two regimes with a particularly large contribution to the spread in tropical mean clear-sky OLR: rather moist regimes at the transition from deep convective to subsidence regimes and very dry subsidence regimes. Particularly for these regimes a better understanding of the processes controlling the RH biases is needed.

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Language(s): eng - English
 Dates: 2021-02-172021-10-132021-10-212021-11
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1029/2021MS002514
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Project name : ESIWACE
Grant ID : 675191
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)
Project name : ESIWACE 2
Grant ID : 823988
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: Journal of Advances in Modeling Earth Systems
  Other : JAMES
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Geophysical Union
Pages: - Volume / Issue: 13 Sequence Number: e2021MS002514 Start / End Page: - Identifier: ISSN: 1942-2466
CoNE: https://pure.mpg.de/cone/journals/resource/19422466