Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models

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...

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Autores principales:	Theresa Lang, Ann Kristin Naumann, Bjorn Stevens, Stefan A. Buehler
Formato:	article
Lenguaje:	EN
Publicado:	American Geophysical Union (AGU) 2021
Materias:	storm‐resolving models humidity free troposphere outgoing longwave radiation Physical geography GB3-5030 Oceanography GC1-1581
Acceso en línea:	https://doaj.org/article/3ee24d82e5944d28a9554443fd941b37
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spelling	oai:doaj.org-article:3ee24d82e5944d28a9554443fd941b372021-11-30T08:40:32ZTropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models1942-246610.1029/2021MS002514https://doaj.org/article/3ee24d82e5944d28a9554443fd941b372021-11-01T00:00:00Zhttps://doi.org/10.1029/2021MS002514https://doaj.org/toc/1942-2466Abstract 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 Wm−2 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.Theresa LangAnn Kristin NaumannBjorn StevensStefan A. BuehlerAmerican Geophysical Union (AGU)articlestorm‐resolving modelshumidityfree troposphereoutgoing longwave radiationPhysical geographyGB3-5030OceanographyGC1-1581ENJournal of Advances in Modeling Earth Systems, Vol 13, Iss 11, Pp n/a-n/a (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	storm‐resolving models humidity free troposphere outgoing longwave radiation Physical geography GB3-5030 Oceanography GC1-1581
spellingShingle	storm‐resolving models humidity free troposphere outgoing longwave radiation Physical geography GB3-5030 Oceanography GC1-1581 Theresa Lang Ann Kristin Naumann Bjorn Stevens Stefan A. Buehler Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
description	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 Wm−2 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.
format	article
author	Theresa Lang Ann Kristin Naumann Bjorn Stevens Stefan A. Buehler
author_facet	Theresa Lang Ann Kristin Naumann Bjorn Stevens Stefan A. Buehler
author_sort	Theresa Lang
title	Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
title_short	Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
title_full	Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
title_fullStr	Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
title_full_unstemmed	Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models
title_sort	tropical free‐tropospheric humidity differences and their effect on the clear‐sky radiation budget in global storm‐resolving models
publisher	American Geophysical Union (AGU)
publishDate	2021
url	https://doaj.org/article/3ee24d82e5944d28a9554443fd941b37
work_keys_str_mv	AT theresalang tropicalfreetropospherichumiditydifferencesandtheireffectontheclearskyradiationbudgetinglobalstormresolvingmodels AT annkristinnaumann tropicalfreetropospherichumiditydifferencesandtheireffectontheclearskyradiationbudgetinglobalstormresolvingmodels AT bjornstevens tropicalfreetropospherichumiditydifferencesandtheireffectontheclearskyradiationbudgetinglobalstormresolvingmodels AT stefanabuehler tropicalfreetropospherichumiditydifferencesandtheireffectontheclearskyradiationbudgetinglobalstormresolvingmodels
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Tropical Free‐Tropospheric Humidity Differences and Their Effect on the Clear‐Sky Radiation Budget in Global Storm‐Resolving Models

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