A5062664445- Climate variability and models
- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Arctic and Antarctic ice dynamics
- Precipitation Measurement and Analysis
- Cryospheric studies and observations
- Tropical and Extratropical Cyclones Research
- Marine and coastal ecosystems
- Methane Hydrates and Related Phenomena
- Ionosphere and magnetosphere dynamics
Karlsruhe Institute of Technology
2018-2023
Colorado State University
2020
Columbia University
2019-2020
Universität Hamburg
2018
Hamburg Institut (Germany)
2018
Abstract By interacting with radiation, clouds modulate the flow of energy through Earth system, circulation atmosphere, and regional climate. We review impact cloud‐radiation interactions for atmospheric in present‐day climate, its internal variability response to climate change. After summarizing cloud‐controlling factors cloud‐radiative effects, we clarify scope limits Clouds On‐Off Klimate Model Intercomparison Experiment (COOKIE) cloud‐locking modeling methods. COOKIE showed that...
Abstract Previous work showed that the poleward expansion of annual-mean zonal-mean atmospheric circulation in response to global warming is strongly modulated by changes clouds and their radiative heating surface atmosphere. Here, a hierarchy an ensemble climate models are used study impact cloud-radiative absence sea temperature (SST), which referred as pathway impact. For MPI-ESM model, responsible for about half total impact, fact response. Changes substantial both lower upper...
Abstract OceanRAIN—the Ocean Rainfall And Ice-phase precipitation measurement Network—provides in-situ along-track shipboard data of precipitation, evaporation and the resulting freshwater flux at 1-min resolution over global oceans from June 2010 to April 2017. More than 6.83 million minutes with 75 parameters 8 ships cover all routinely measured atmospheric oceanographic state variables along those required derive turbulent heat fluxes. The parameter is based on measurements optical...
Abstract Previous work demonstrated the strong radiative coupling between clouds and midlatitude circulation. Here we investigate impact of cloud‐radiative changes on global warming response jet streams storm tracks in North Atlantic, Pacific, Southern Hemisphere. To this end, use ICOsahedral Nonhydrostatic atmosphere model present‐day setup with cloud‐locking method. Sea surface temperatures are prescribed to isolate circulation atmospheric heating. In annual mean, contribute one two thirds...
Abstract The impact of cloud‐radiative interactions on the tropical circulation and its response to surface warming are studied in aquaplanet model simulations with prescribed sea‐surface temperatures from eight global atmosphere models. Simulations enabled disabled compared. In a present‐day‐like climate, presence strengthens Hadley cell, narrows ascent, widens subtropical descent. These cloud impacts robust across models shown be related energetics mass constraints atmosphere....
Abstract. Cloud-radiative heating (CRH) within the atmosphere and its changes with warming affect large-scale atmospheric winds in a myriad of ways, such that reliable predictions projections circulation require calculations CRH. In order to assess sensitivities upper-tropospheric midlatitude CRH model settings, we perform series simulations ICOsahedral Nonhydrostatic Model (ICON) over North Atlantic using six different grid spacings, parameterized explicit convection, one- versus two-moment...
Abstract Climate change leads to changes in cloud‐radiative heating, which previous work showed have a substantial impact on the response of atmospheric circulation climate change. We here compare what extent this models can be diagnosed by locking method and Cookie method. show that reliably diagnoses impact. In contrast, method, is easier use valuable for studying how presence clouds affects present‐day circulation, inadequate context It misdiagnoses misses robust aspects it, including...
Abstract The North Atlantic jet stream is projected to extend eastward towards Europe in boreal winter response climate change. We show that this robust across a hierarchy of models and change scenarios. further cloud-radiative changes contribute robustly the extension three atmosphere models, but lead model uncertainties over Atlantic. magnitude cloud contribution depends on model, consistent with differences upper-tropospheric heating. study role regional one i.e. ICON model. Tropical...
Abstract Previous studies showed that global cloud-radiative changes contribute half or more to the midlatitude atmospheric circulation response warming. Here, we investigate relative importance of tropical, midlatitude, and polar for annual-mean, wintertime, summertime across regions in AMIP-like simulations. To this end, study warming simulations from ICON model run with cloud-locking method prescribed sea surface temperatures, which isolate impact heating. Tropical cloud dominate on 850...
Clouds and the midlatitude circulation are strongly coupled via radiation. Previous work showed that about half of annual-mean zonal-mean jet stream storm track responses to global warming can be attributed cloud-radiative changes. In this thesis, we investigate impact changes on response streams tracks across seasons regions with special focus North Atlantic, Pacific Southern Hemisphere. To end, perform simulations atmospheric component ICOsahedral Nonhydrostatic (ICON) model in a...
Table S1.Cloud fraction values in the HIGH, MIDDLE, and LOW altitudinal ranges using three sets of percentiles across simulations different grid spacings with one-moment microphysics.80 km 40 20 10 5 2.5 -shcon
Abstract. Cloud-radiative heating (CRH) within the atmosphere and its changes with warming affect large-scale atmospheric wind patterns in a myriad of ways, such that reliable predictions projections circulation require calculations CRH. In order to assess sensitivities upper-tropospheric midlatitude CRH model settings, we perform series simulations Icosahedral Nonhydrostatic Model (ICON) over North Atlantic using six different grid spacings, parameterized explicit convection, one- versus...