A5089460448- Climate variability and models
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Tropical and Extratropical Cyclones Research
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Tree-ring climate responses
- Plant Water Relations and Carbon Dynamics
- Cryospheric studies and observations
- Hydrology and Watershed Management Studies
- Complex Systems and Time Series Analysis
- Geophysics and Gravity Measurements
- Hydrology and Drought Analysis
- Atmospheric chemistry and aerosols
- Climate change impacts on agriculture
- Marine and coastal ecosystems
- Environmental and Agricultural Sciences
- Environmental Changes in China
- Remote Sensing in Agriculture
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Geological and Geophysical Studies
- GNSS positioning and interference
- Climate change and permafrost
Universität Hamburg
2012-2022
Max Planck Institute for Meteorology
2009-2022
Xuchang University
2021
The First People's Hospital of Guiyang
2020
University of Chinese Academy of Sciences
2019
Raffles Institution
2019
Institute of Atmospheric Physics
2019
Infektionsmedizinisches Centrum Hamburg
2016
Johns Hopkins University
2014-2015
Clinical Research Organization
2012
Abstract The representation of tropical precipitation is evaluated across three generations models participating in phases 3, 5, and 6 the Coupled Model Intercomparison Project (CMIP). Compared to state-of-the-art observations, improvements CMIP6 are identified for some metrics, but we find no general improvement on different temporal spatial scales. Our results indicate overall little changes CMIP summer monsoons, double-ITCZ bias, diurnal cycle precipitation. We a reduced amount drizzle...
Abstract Several studies show that the anomalous long-lasting Russian heat wave during summer of 2010, linked to a long-persistent blocking high, appears mainly as result natural atmospheric variability. This study analyzes large-scale flow structure based on ECMWF Re-Analysis Interim (ERA-Interim) data (1989–2010). The high over western Russia including occurs an overlay set anticyclonic contributions different time scales. (i) A regime change in ENSO toward La Niña modulates...
Abstract Extratropical and tropical influences on Tibetan Plateau severe extreme dry wet summer months are investigated focussing the large‐scale circulation using results of coupled climate model ECHAM5/MPI‐OM. A pre‐industrial control run scenario runs for 4th Assessment Report Intergovernmental Panel Climate Change (IPCC) considered. precipitation in wetness drought is related to atmospheric anomalies North‐Atlantic/European sector sea surface temperature Tropics. Drought associated with...
On the basis of daily observations 39 meteorological stations in Tarim River Basin, variability drought and wetness has been analysed using standardized precipitation-evapotranspiration index (SPEI, 1961–2010). The result shows an increasing trend annual mean SPEI with a significant change 1986. Although frequency moderate severe droughts decreased after change, extreme events increased slightly. But different categories show consistent increase frequency. return periods prolonged shortened,...
ABSTRACT Climate warming on the Tibetan Plateau ( TP ) potentially influences many climate parameters other than temperature including wind speed, cloudiness and precipitation. Temporal trends of surface speed at 71 stations above 2000 m sea level in are examined during 1980–2005. To uncover causes observed relationships with temperature, a index sunshine duration also analysed. The is calculated as accumulated 500 hPa geopotential height 5000 over region 30°N–40°N, 75°E–105°E from NCEP /...
Abstract We describe the ocean general circulation model Ico sahedral N onhydrostatic Weather and Climate Model (ICON‐O) of Max Planck Institute for Meteorology, which forms ocean‐sea ice component Earth system ICON‐ESM. ICON‐O relies on innovative structure‐preserving finite volume numerics. demonstrate fundamental ability to simulate key features global dynamics at both uniform non‐uniform resolution. Two experiments are analyzed compared with observations, one a nearly eddy‐rich...
Abstract Effects of large‐scale atmospheric circulation and surface temperatures on extreme dryness wetness the Tibetan plateau in summer are analysed using ERA‐40 reanalysis observed precipitation. The cases drought can be associated with anomalies North Atlantic/European sector wave trains bridging Eurasian continent. Drought Tibet reveals an intense high pressure anomaly over Scandinavia supported by a more south‐west to north‐east orientated Atlantic stormtrack. This creates crossing...
Over the Far East in summer, climate is strongly influenced by fluctuating Western Pacific Subtropical High (WPSH), and strong precipitation often associated with southeasterly low‐level wind that brings moist air from southern China seas. The WPSH intraseasonal variability partly quasi‐stationary wave‐trains propagating eastwards Europe across Asia along two westerly jets: Silk‐Road wave‐train Asian jet at midlatitudes polar sub‐polar jet. In unusual summer of 2010, northeast experienced...
Abstract The authors use a statistical regional climate model [Statistical Regional Model (STAR)] to project the Tibetan Plateau (TP) for period 2015–50. Reanalysis datasets covering 1958–2001 are used as substitute of observations and resampled by STAR optimally fit prescribed linear temperature trends derived from Max Planck Institute Earth System (MPI-ESM) simulations phase 5 Coupled Intercomparison Project (CMIP5) under representative concentration pathway 2.6 (RCP2.6) RCP4.5 scenarios....
The thermal forcing of the Tibetan Plateau (TP) is analyzed to investigate formation and variability Summer Monsoon (TPSM), which affects climates surrounding regions, in particular Indian summer monsoon precipitation. Dynamic composites statistical analyses indicate that precipitation less/greater than normal during strong/weak TPSM. Strong (weak) TPSM associated with an anomalous near surface cyclone (anticyclone) over western part Plateau, enhancing (reducing) westerly flow along its...
East Asia has experienced strong warming since the 1960s accompanied by an increased frequency of heat waves and shrinking glaciers over Tibetan Plateau Tien Shan. Here, we place recent warmth in a long-term perspective presenting new spatially resolved warm-season (May-September) temperature reconstruction for period 1-2000 CE using 59 multiproxy records from wide range Asian regions. Our Bayesian Hierarchical Model (BHM) based reconstructions generally agree with earlier shorter regional...
Abstract. We describe the development, tuning and climate of Planet Simulator (PLASIM)–Grid-ENabled Integrated Earth system model (GENIE), a new intermediate complexity Atmosphere–Ocean General Circulation Model (AOGCM), built by coupling to ocean, sea-ice land-surface components GENIE model. PLASIM–GENIE supersedes GENIE-2, Reading Intermediate (IGCM). The primitive-equation atmosphere includes chaotic, three-dimensional (3-D) motion interactive radiation clouds, dominates computational...
To complement geographical presentation of remote sensing vegetation information, the authors apply Budyko’s physical state space diagram to analyze functional climate relations. As an example, use Interim ECMWF Re-Analysis (ERA-Interim) global weather data provide statistics (1982–2006) states in a two-dimensional spanned by water demand (net radiation N) versus water/energy limitation (dryness ratio D net over precipitation). Embedding sensing–based Global Inventory Modeling and Mapping...
Continuum temperature variability represents the response of Earth's climate to deterministic external forcing. Scaling regimes are observed which range from hours millennia with low frequency fluctuations characterizing long-term memory. The presence 1/f power spectra in weather and is noteworthy: (i) In tropical atmosphere scaling ranging weeks found for several variables; it emerges as superposition uncorrelated pulses individual spectra. (ii) daily discharge Yangtze shows within one week...
Abstract Climate forecast skills are evaluated for surface temperature time series at grid points of a millennium control simulation from state-of-the-art global circulation model [ECHAM5–Max Planck Institute Ocean Model (MPI-OM)]. First, climate predictability is diagnosed in terms potentially predictable variance fractions and the fluctuation power-law exponent (using detrended analysis). Long-term memory (LTM) with (or Hurst exponent) close to 0.9 occurs mainly high-latitude oceans, which...
Interdecadal variability of observed winter precipitation in Southeast China (1961–2010) is characterized by the first empirical orthogonal function three-monthly Standardized Precipitation Index (SPI) subjected to a 9-year running mean. For interdecadal time scales dominating spatial modes represent monopole features involving Arctic Oscillation (AO) and sea surface temperature (SST) anomalies. Dynamic composite analysis (based on NCEP/NCAR reanalyzes) reveals following results: (1)...
Abstract Vegetation greenness distributions [based on remote sensing normalized difference vegetation index (NDVI)] and their change are analyzed as functional vegetation–climate relations in a two-dimensional ecohydrological state space spanned by surface flux ratios of energy excess (U; loss sensible heat H over supply net radiation N) versus water (W; discharge Ro gain precipitation P). An ansatz attributes trajectories (U, W) to external (or climate) internal anthropogenic) causes...