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Cirrus clouds, ice supersaturation, and their dynamical background

Gierens, Klaus Martin and Hofer, Sina Maria (2023) Cirrus clouds, ice supersaturation, and their dynamical background. Clouds Containing Ice Particles, 24.-26. Juli 2023, Mainz, Deutschland.

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Although this conference is on cirrus clouds, we may not forget, that the condition sine-qua-non for cirrus is ice supersaturation. This lecture is therefore on ice supersaturation. Perhaps not surprisingly, ice supersaturation in the upper troposphere is quite difficult to forecast. As it is an extremal state in the humidity field, it reacts non-linearly to changes in ambient conditions. Water vapour takes place in many different chemical and physical processes and is thus highly variable with strong gradients. Reliable measurements of humidity in the tropopause region are largely lacking, so that there is not much for weather models to assimilate. In the lecture, we will talk about a related quantity termed upper-tropospheric humidity, a satellite-derived radiation quantity that is intended to describe the humidity field in the UT. We will introduce the contribution and weighting functions and show some applications. Second we will show how ice supersaturated regions are connected to the dynamic quantities in the synoptic fields and we show how one can try to exploit these dynamic quantities for an improved prediction of ice supersaturation.

Item URL in elib:https://elib.dlr.de/196283/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Der Vortrag enthält Ergebnisse, die im Rahmen des H2020 Projekts ACACIA erarbeitet worden sind bzw. werden (Grant Number 875036).
Title:Cirrus clouds, ice supersaturation, and their dynamical background
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gierens, Klaus MartinDLR, IPAhttps://orcid.org/0000-0001-6983-5370UNSPECIFIED
Hofer, Sina MariaDLR, IPAhttps://orcid.org/0000-0002-6148-2053UNSPECIFIED
Date:25 July 2023
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Ice supersaturation, upper-tropospheric humidity, contribution and weighting functions, dynamical proxies
Event Title:Clouds Containing Ice Particles
Event Location:Mainz, Deutschland
Event Type:international Conference
Event Dates:24.-26. Juli 2023
Organizer:International Commission for Clouds and Precipitation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Air Transportation and Impact
DLR - Research area:Aeronautics
DLR - Program:L AI - Air Transportation and Impact
DLR - Research theme (Project):L - Climate, Weather and Environment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Gierens, Dr.rer.nat. Klaus Martin
Deposited On:31 Jul 2023 14:22
Last Modified:31 Jul 2023 14:22

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