A5039121732- Arctic and Antarctic ice dynamics
- Oceanographic and Atmospheric Processes
- Climate variability and models
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- Meteorological Phenomena and Simulations
- Ocean Waves and Remote Sensing
- Geological Studies and Exploration
- Tropical and Extratropical Cyclones Research
- Cryospheric studies and observations
- Climate change and permafrost
- Atmospheric and Environmental Gas Dynamics
- Soil Moisture and Remote Sensing
- Precipitation Measurement and Analysis
- Marine and coastal ecosystems
- Atmospheric chemistry and aerosols
- Icing and De-icing Technologies
- Aeolian processes and effects
- Paleontology and Stratigraphy of Fossils
- Science and Climate Studies
National University of Defense Technology
2017-2024
Peking University
2014-2022
Ocean University of China
2020-2021
Changsha University
2019
Delft University of Technology
2019
University of California, Los Angeles
2018
Abstract A decrease in surface albedo over ice‐covered ocean leads to global warming and Arctic‐amplified warming. Numerical results indicate seasonal variation Arctic amplification (AA) is a result of local forcing feedbacks the Arctic. positive feedback, which dominates feedback mechanism. Ocean heat storage subsurface acts as delay influence feedback. In summer (autumn), increases (discharges) contributes negative (positive) forcing, decreases (increases) triggers occurrence minimum...
Effects of wind and fresh water on the Atlantic meridional overturning circulation (AMOC) are investigated using a fully coupled climate model. The AMOC can change significantly when perturbed by either stress or freshwater flux in North Atlantic. This study focuses effect. Our model results show that forcing is crucial maintaining AMOC. Reducing over ocean cause immediately weakening vertical salinity diffusion convection mid-high latitudes Atlantic, resulting an enhancement stratification...
The effect of the ocean surface winds on meridional heat transports is studied in a coupled model. Shutting down global causes significant reductions both wind-driven and thermohaline circulations, resulting remarkable decrease poleward oceanic transport (OHT). sea temperature responds with warming equator cooling off equator, causing an enhancement equatorward shift Hadley cell. This increases atmospheric (AHT), which turn compensates OHT. compensation implies fundamental constraint changes...
Observations of sea surface wind field are critical for typhoon prediction. The scatterometer observation is one the most important sources winds, which provides both speed and direction information. However, spatial resolution low. Synthetic Aperture Radar (SAR) can provide a more detailed structure tropical cyclone. In addition, cross-polarization SAR information high (>25 m·s − 1 ) than scatterometer. Nevertheless, due to narrow swath SAR, number retrieved data used in assimilation...
The roles of energy balance and climate feedback in Bjerknes compensation (BJC) are studied through wind-perturbation experiments a coupled model. Shutting down surface winds over the ocean causes significant reductions both wind-driven thermohaline overturning circulations, leading to remarkable decrease poleward heat transport (OHT). sea temperature (SST) responds with an increasing meridional gradient, resulting stronger Hadley Cell, thus enhanced atmosphere (AHT), compensating OHT...
Abstract The recent colder winters in midlatitude Eurasia have been proposed to result from Arctic sea-ice decline. However, large uncertainties remain regarding this link the present variable climate. Here, we ice-rafted debris records eastern and geochemical data temperate East China Sea reconstruct Holocene changes sea ice Asian winter monsoon. Our reconstructions climate numerical simulations revealed enhanced decline but warmer Asia mid-Holocene than late Holocene. In mid-Holocene, loss...
Abstract Reanalysis data and numerical model are employed to uncover the mechanisms of spring (March–April) Arctic surface warming. Different from other seasons, little additional solar radiation absorption or seasonal heat storage release contributes warming in spring. Both observation results suggest that horizontal advection dominates air However, originates lower latitudes instead local energy redistribution as seasons. Furthermore, weakens meridional potential vorticity gradient, which...
Abstract The reanalysis data suggest that recent surface warming over Antarctica start in 2016. In this study, using and numerical simulations, I attempt to determine the important mechanisms accounting for seasonal Antarctica. results suggested is mainly determined by energy budget Antarctic via horizontal heat advection. anomaly Antarctic, which anomalous solar radiation absorption, ocean content, meridional atmospheric transport (AHT), triggered sea‐ice loss thus determines observational...
Abstract Reanalysis data and a numerical model are employed to explore how diffusion in the upper ocean evolves different seasons understand its contribution seasonal heat storage (SHS) Arctic amplification. The simulation results closely consistent with observations. First, solar radiation absorption anomaly (maximum June) due ice‐loss is mainly stored as SHS June July) or warms surface (minimum Furthermore, suggests that vertical dominates formation/discharge. Second, becomes warmer than...
Redundant observations impose a computational burden on an operational data assimilation system, and using high-resolution satellite observation sets at full resolution leads to poorer analyses forecasts than lower sets, since may introduce correlated error in the assimilation. Thus, it is essential thin alleviate these problems. Superobbing like other thinning methods lowers effect of by reducing density. Besides, has added advantage uncorrelated through averaging. However, method averaging...
The impact on the Gulf Stream and Kuroshio from Arctic sea ice loss is investigated using Community Climate System Model version 4 (CCSM4) model for their important roles during climate change. Results show that (Kuroshio) weakens (strengthens) in response to via ocean (atmosphere) adjustments. More precisely, acceleration mainly due anomalous wind stress over North Pacific, while gyre adjustments Atlantic are responsible weakened Stream. As positive buoyancy fluxes induced by trigger a...
Abstract Surface albedo over the ice‐covered polar ocean is decreased in a highly idealized numerical experiment, which leads to stronger (weaker) warming at high (low) latitudes, and forms Arctic amplification. With both low meridional temperature gradient decreases (increases) midlatitudes (subtropical regions). A cyclonic wind anomaly appears results weak Kuroshio current warm interdecadal Pacific Oscillation phase. In response Arctic‐amplified‐warming, subtropical weakens, leading summer...
This paper focuses on the data assimilation methods for sea surface winds, based level-2B HY-2A satellite microwave scatterometer wind products. We propose a new feature thinning method, which is herein used to screen winds while maintaining key structure of field in process highresolution observations. also accomplish feeding ambiguous solutions directly into system, thus making better use retrieved information simplifying A numerical simulation experiment involving Typhoon Danas shows that...
The trajectories of the winter cyclone and thermal field anomaly over Northwest Pacific Ocean were studied with atmospheric reanalysis data (from NCEP/NCAR) SST's observational Met Office Hadley Centre National Climatic Data Center NOAA). results showed that would change as a response to circulation shift (e.g. meridional motion WPJS). When WPJS leaned north, SHF LHF be positive (negative) in mid-high (low) latitude, while Qs SST presented negative latitude. As result, dipole-pattern (+ -)...
Abstract Previous studies are mainly limited to temperature and salinity ( T / S ) profiling data assimilation, while assimilation based on Argo float trajectory information has received less research focus. In this study, a new method was proposed assimilate data: the middepth (indicates parking depth of floats in ~1200 m) velocities estimated from trajectories subsequently assimilated into Regional Ocean Model System (ROMS) using four-dimensional variational (4DVAR) method. This can avoid...