A5079837942- Climate variability and models
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Oceanographic and Atmospheric Processes
- Atmospheric chemistry and aerosols
- Meteorological Phenomena and Simulations
- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- demographic modeling and climate adaptation
- Tropical and Extratropical Cyclones Research
- Electrochemical Analysis and Applications
- Ionosphere and magnetosphere dynamics
- Distributed and Parallel Computing Systems
- Fuel Cells and Related Materials
- Scientific Computing and Data Management
- Electrocatalysts for Energy Conversion
- Geomagnetism and Paleomagnetism Studies
- Marine and environmental studies
- Geology and Paleoclimatology Research
- Ocean Waves and Remote Sensing
- Nuclear reactor physics and engineering
- Climate change impacts on agriculture
- Agriculture, Plant Science, Crop Management
- Children's Physical and Motor Development
- Spaceflight effects on biology
GEOMAR Helmholtz Centre for Ocean Research Kiel
2009-2024
Humboldt-Universität zu Berlin
2019
Tel Aviv University
2018
Bjerknes Centre for Climate Research
2018
University of Bergen
2018
University of Chicago
2018
Abstract. The chemistry–climate model ECHAM-HAMMOZ contains a detailed representation of tropospheric and stratospheric reactive chemistry state-of-the-art parameterizations aerosols using either modal scheme (M7) or bin (SALSA). This article describes evaluates the version ECHAM6.3-HAM2.3-MOZ1.0 with focus on gas-phase chemistry. A 10-year simulation was performed to test stability provide data for its evaluation. comparison observations concentrates year 2008 includes total column ozone CO...
Abstract. Changes in stratospheric ozone concentrations and increasing of greenhouse gases (GHGs) alter the temperature structure atmosphere drive changes atmospheric oceanic circulation. We systematically investigate impacts recovery GHGs on circulation Southern Hemisphere during twenty-first century using a unique coupled ocean–atmosphere climate model with interactive chemistry enhanced resolution. use high-emission scenario SSP5-8.5 for under which springtime Antarctic total column...
Abstract. A new Earth system model, the Flexible Ocean and Climate Infrastructure (FOCI), is introduced. first version of FOCI consists a global high-top atmosphere (European Centre Hamburg general circulation model; ECHAM6.3) an ocean model (Nucleus for European Modelling v3.6; NEMO3.6) as well sea-ice (Louvain-la-Neuve sea Ice Model 2; LIM2) land surface components (Jena Scheme Biosphere Atmosphere Coupling in Hamburg; JSBACH), which are coupled through OASIS3-MCT software package....
Abstract. To better understand possible reasons for the diverse modeling results and large discrepancies of detected solar fingerprints, we took one step back assessed “initial” signals in middle atmosphere based on a set ensemble historical simulations with multiple climate models – Flexible Ocean Climate Infrastructure (FOCI), ECHAM/MESSy Atmospheric Chemistry (EMAC), Max Planck Institute Meteorology Earth System Model high-resolution configuration (MPI-ESM-HR). Consistent previous work,...
Abstract This study investigates the interaction of quasi-biennial oscillation (QBO) and El Niño–Southern Oscillation (ENSO) in troposphere separately for North Pacific Atlantic region. Three 145-yr model simulations with NCAR’s Community Earth System Model Whole Atmosphere Climate (CESM-WACCM) are analyzed where only natural (no anthropogenic) forcings considered. These long allow authors to obtain statistically reliable results from an exceptional large number cases each combination QBO...
Abstract Downward wave coupling occurs when an upward-propagating planetary from the troposphere decelerates flow in upper stratosphere and forms a downward reflecting surface that redirects waves back to troposphere. To test this mechanism potential factors influencing coupling, three 145-yr sensitivity simulations with NCAR’s Community Earth System Model [CESM1(WACCM)], state-of-the-art high-top chemistry–climate model, are analyzed. The results show quasi-biennial oscillation (QBO) SST...
Abstract. The consideration of marine biogeochemistry is essential for simulating the carbon cycle in an Earth system model. Here we present implementation and evaluation a biogeochemical model, Model Oceanic Pelagic Stoichiometry (MOPS) Flexible Ocean Climate Infrastructure (FOCI) climate FOCI-MOPS enables simulation biological processes, i.e. carbon, nitrogen, oxygen cycles with prescribed or prognostic atmospheric CO2 concentration. A series experiments covering historical period...
Abstract Observations show that the Equatorial Atlantic Zonal Mode (ZM) obeys similar physics to El Niño Southern Oscillation (ENSO): positive Bjerknes and delayed negative feedbacks. This implies ZM may be predictable on seasonal timescales, but models demonstrate little prediction skill in this region. In study using different configurations of Kiel Climate Model (KCM) exhibiting levels systematic error, we a reasonable simulation depends realistic representation mean state, i.e., surface...
Abstract. We examine the impact of horizontal resolution and model time step on climate OpenIFS version 43r3 atmospheric general circulation model. A series simulations for period 1979–2019 are conducted with various resolutions (i.e. ∼100, ∼50, ∼25 km) while maintaining same 15 min) using different steps 60, 30, at 100 km resolution. find that surface zonal wind bias is significantly reduced over certain regions such as Southern Ocean Northern Hemisphere mid-latitudes in tropical...
Abstract. It is well established that variable wintertime planetary wave forcing in the stratosphere controls variability of Arctic stratospheric ozone through changes strength polar vortex and residual circulation. While previous studies focused on variations upward flux entering lower stratosphere, here impact downward reflection investigated for first time. Utilizing MERRA2 reanalysis a fully coupled chemistry–climate simulation with Community Earth System Model (CESM1(WACCM)) National...
Abstract. The Antarctic ozone hole has led to substantial changes in the Southern Hemisphere atmospheric circulation, such as strengthening and poleward shift of midlatitude westerly jet. Ozone recovery during twenty-first century is expected continue affect jet's strength position, leading opposite direction compared twentieth competing with effect increasing greenhouse gases. Simulations Earth's past future climate, those performed for Coupled Model Intercomparison Project Phase 6 (CMIP6),...
Abstract There is evidence that the strengthened stratospheric westerlies arising from Antarctic ozone hole–induced cooling cause a polar mesospheric warming and subsequent in lower thermosphere. While previous studies focus on role of nonresolved (gravity) wave drag filtering, here resolved (planetary) radiative forcing mesosphere thermosphere (MLT) explored detail. Using simulations with NCAR’s Community Earth System Model, version 1 (Whole Atmosphere Climate Model) [CESM1(WACCM)], it...
Abstract Increasing the horizontal resolution of an ocean model is frequently seen as a way to reduce biases in North Atlantic, but we are often limited by computational resources. Here, two‐way nested configuration (VIKING10) that consists high‐resolution (1/10°) component and covers northern embedded 1/2° grid part global chemistry‐climate model, FOCI (called FOCI‐VIKING10). This yields significantly improved path Atlantic current (NAC), which here reduces cold bias ∼50%. Compared with...
Abstract. The radiative effects induced by the zonally asymmetric part of ozone field have been shown to significantly change temperature NH winter polar cap, and correspondingly strength vortex. In this paper, we aim understand physical processes behind these using National Center for Atmospheric Research (NCAR)'s Whole Atmosphere Community Climate Model, run with 1960s ozone-depleting substances greenhouse gases. We find a mid-winter vortex influence only when considering quasi-biennial...
Abstract. Southern Hemisphere lower-stratospheric ozone depletion has been shown to lead a poleward shift of the tropospheric jet stream during austral summer, influencing surface atmosphere and ocean conditions, such as temperatures sea ice extent. The characteristics stratospheric responses depletion, however, differ among climate models depending on representation in models. most appropriate way represent model is calculate it interactively. However, due computational costs, particular...
Abstract Ridging South Atlantic Anticyclones contribute an important amount of precipitation over Africa. Here, we use a global coupled climate model and the ERA5 reanalysis to separate for first time ridging highs (RHs) based on whether they occur together with Rossby wave breaking (RWB) or not. We show that former type RHs are associated more than latter type. The mean sea level pressure anomalies caused by two types characterized distinct patterns, leading differences in flow...
Abstract. El Niño–Southern Oscillation (ENSO) is a major source for teleconnections, including towards the tropical North Atlantic (TNA) region, whereby TNA sea surface temperatures (SSTs) are positively correlated with ENSO in boreal spring following an event. However, Pacific–Atlantic connection can be impacted by different characteristics, such as amplitude, location, and timing of Pacific SST anomalies (SSTAs). Indeed, SSTAs may respond nonlinearly to strong extreme Niño events....
Abstract The recent severe European summer heat waves of 2015 and 2018 co‐occurred with cold subpolar North Atlantic (NA) sea surface temperatures (SSTs). However, a significant connection between this oceanic state was not yet established. We performed two AMIP‐like model experiments: (a) employing daily SSTs as observed (b) applying novel approach to remove the negative NA SST anomaly, while keeping small‐scale variability. Comparing these experiments, we find that significantly increase...
Abstract. A new Earth system model, the Flexible Ocean and Climate Infrastructure (FOCI), is introduced. first version of FOCI consists a global high-top atmosphere (ECHAM6.3) an ocean model (NEMO3.6) as well sea ice (LIM2) land surface components (JSBACH), which are coupled through OASIS3-MCT software package. includes number optional modules can be activated depending on scientific question interest. In atmosphere, interactive stratospheric chemistry used (ECHAM6-HAMMOZ) to study, for...
Abstract Downward wave coupling (DWC) is an important process that characterizes the dynamical between stratosphere and troposphere via planetary reflection. A recent modeling study has indicated natural forcing factors, including sea surface temperature (SST) variability quasi-biennial oscillation (QBO), influence DWC associated impact in Northern Hemisphere (NH). In light of this, authors further investigate how NH affected by anthropogenic forcings, using a fully coupled chemistry–climate...
Abstract. It is well established that variable wintertime planetary wave forcing in the stratosphere controls variability of Arctic stratospheric ozone through changes strength polar vortex and residual circulation. While previous studies focused on variations upward flux entering lower stratosphere, here impact downward coupling (DWC) investigated for first time. Utilizing MERRA-2 reanalysis a fully coupled chemistry-climate simulation with NCAR's Community Earth System Model...
Abstract. Southern hemisphere lower stratospheric ozone depletion has been shown to lead a poleward shift of the tropospheric jet stream during austral summer, influencing surface atmosphere and ocean conditions, such as temperatures sea ice extent. The characteristics responses depletion, however, differ largely among climate models depending on representation in models. most accurate way represent model is calculate it interactively. However, due computational costs, particular for...
In recent decades, the Northern Hemisphere (NH) exhibits a long-term regional cooling (central Eurasia) and warming (Arctic America) trend caused by human-induced anthropogenic forcing internal decadal variability. this study, we quantify contribution of variability to NH temperature using an atmosphere general circulation model (OpenIFS) designing some sensitivity experiments for period 1950-2014. reanalysis dataset (ERA5), find significant teleconnection between Interdecadal Pacific...