A5061045446- Climate variability and models
- Atmospheric Ozone and Climate
- Arctic and Antarctic ice dynamics
- Atmospheric chemistry and aerosols
- Geochemistry and Geologic Mapping
- Geological and Geochemical Analysis
- Meteorological Phenomena and Simulations
- Oceanographic and Atmospheric Processes
- Atmospheric and Environmental Gas Dynamics
- Climate change and permafrost
- Geochemistry and Geochronology of Asian Mineral Deposits
- Geological and Geophysical Studies
- Hydrocarbon exploration and reservoir analysis
- Cryospheric studies and observations
- earthquake and tectonic studies
- Geological formations and processes
- Geochemistry and Elemental Analysis
- Environmental and Agricultural Sciences
- Tropical and Extratropical Cyclones Research
- Geomechanics and Mining Engineering
- High-pressure geophysics and materials
- Air Quality and Health Impacts
- Methane Hydrates and Related Phenomena
- Water Quality and Pollution Assessment
- Geoscience and Mining Technology
Fudan University
2018-2024
Yunnan University
2024
Kunming University of Science and Technology
2007-2024
China Geological Survey
2011-2024
ShangHai JiAi Genetics & IVF Institute
2021-2023
Lamont-Doherty Earth Observatory
2015-2023
Columbia University
2015-2023
Peking University
2013-2023
Beijing Normal University
2021-2022
Zhuhai Fudan Innovation Research Institute
2021-2022
High-resolution ice concentration maps are of great interest for ship navigation and hazard forecasting. In this case study, a convolutional neural network (CNN) has been used to estimate using synthetic aperture radar (SAR) scenes captured during the melt season. These dual-pol RADARSAT-2 satellite images as input, is direct output from CNN. With no feature extraction or segmentation postprocessing, absolute mean errors generated less than 10% on average when compared with manual...
A key determinant of winter weather and climate in Europe North America is the Atlantic Oscillation (NAO), dominant mode atmospheric variability domain. Skilful seasonal forecasting surface both reflected largely how accurately models can predict NAO. Most dynamical models, however, have limited skill forecasts new empirical model proposed for forecast NAO that exhibits higher than current models. The provides robust skilful prediction December-January-February (DJF) mean index using a...
[1] The stratospheric climate and variability from simulations of sixteen chemistry-climate models is evaluated. On average the polar night jet well reproduced though its less with a large spread between models. Polar temperature biases are than 5 K except in Southern Hemisphere (SH) lower stratosphere spring. accumulated area low temperatures responsible for cloud formation accurately Antarctic but underestimated Arctic. shape position vortex simulated, as tropical upwelling stratosphere....
The present work identifies two types of La Niña based on the spatial distribution sea surface temperature (SST) anomaly. In contrast to eastern Pacific (EP) event, a new type (central Pacific, or CP Niña) is featured by SST cooling center over CP. These exhibit fundamental difference in anomaly evolution: EP shows westward propagation feature while exhibits standing can give rise significantly different teleconnection around globe. As response Niña, North Atlantic (NA)–Western European (WE)...
Heavy crude oil can be upgraded to lighter using several techniques. However, current methods usually require high temperatures, long reaction duration, and cause serious environmental pollution. This study shows that by carbon nanocatalysts, heavy efficiently at a relatively low temperature of about 150 °C. The was increased microwave heating. technique proposed in this has the following advantages: (1) great viscosity reduction ratio over 96%, (2) short time (less than 1 h), (3) required...
In this study, a convolutional neural network (CNN) is used to estimate sea ice concentration using synthetic aperture radar (SAR) scenes acquired during freeze-up in the Gulf of St. Lawrence on east coast Canada. The estimates from CNN are compared those (multi-layer perceptron or MLP) that uses hand-crafted features as input and single layer hidden nodes. found be less sensitive pixel level details than MLP produces noisy closer agreement with image analysis charts. This due multi-layer...
Continued rise of the tropopause after 2000 in Northern Hemisphere is mainly due to tropospheric warming.
Abstract Recent Arctic sea ice changes have important societal and economic impacts may lead to adverse effects on the ecosystem, weather, climate. Understanding predictability of melting is thus an task. A vector autoregressive (VAR) model evaluated for predicting summertime (May–September) daily concentration intraseasonal time scale, using only data without direct information atmosphere ocean. The forecast skill assessed 1979–2012 satellite data. cross-validated VAR found be superior both...
Substantial increases in the atmospheric concentration of well-mixed greenhouse gases (notably CO2), such as those projected to occur by end 21st century under large radiative forcing scenarios, have long been known cause an acceleration Brewer-Dobson circulation (BDC) climate models. More recently, however, several single-model studies proposed that ozone-depleting substances might also be important drivers BDC trends. As these were conducted with different forcings over periods, it is...
The increased fraction of first year ice (FYI) at the expense old (second-year (SYI) and multi-year (MYI)) likely affects permeability Arctic cover. This in turn influences pathways gases circulating therein exchange interfaces with atmosphere ocean. We present sea temperature salinity time series from different types relevant to temporal development brine drainage efficiency freeze-up October onset spring warming May. Our study is based on a dataset collected during Multidisciplinary...
Abstract The Summer North Atlantic Oscillation is the primary mode of atmospheric variability in region and has a significant influence on regional European, American Asian summer climate. However, current dynamical seasonal prediction systems show no skill, leaving society ill-prepared for extreme summers. Here we an unexpected role stratosphere driving both observations climate systems. anomalous strength lower polar vortex late spring found to propagate downwards Oscillation. Windows...
Satellite observations and chemistry‐climate model experiments are used to understand the zonal structure of tropical lower stratospheric temperature, water vapor, ozone trends. The warming in upper troposphere over past 30 years is strongest near Indo‐Pacific warm pool, while trend western central Pacific much weaker. In stratosphere, these trends reversed: historical cooling pool weakest Pacific. These variations stronger than zonal‐mean response boreal winter. Targeted with a demonstrate...
Abstract A linear Markov model has been developed to predict sea ice concentration (SIC) in the pan-Arctic region at intraseasonal seasonal time scales, which represents an original effort use a reduced-dimension statistical forecasting Arctic year-round. The was built capture covariabilities atmosphere–ocean–sea system defined by SIC, surface temperature, and air temperature. Multivariate empirical orthogonal functions of these variables served as building blocks model. series experiments...
The subseasonal predictability of surface temperature and precipitation is examined using two global ensemble prediction systems (ECMWF VarEPS NCEP CFSv2), with an emphasis on the week 3–4 lead (i.e. 15–28 days ahead) fortnight-average anomaly correlation skill over United States, in each calendar season. Although ECMWF system exhibits slightly higher for both general, these show similar geographical variations all seasons encouraging certain regions. regions are then interpreted terms...
Abstract Sudden stratospheric warmings (SSWs) are amongst the most dramatic events in Earth’s atmosphere and they drive extreme surface weather conditions. They have been recently linked to hot dry conditions that favour wildfires over Australia. However, chance of a southern hemisphere event is unknown because it has only observed once. Legitimate estimation frequency SSW requires large sample realistic model simulations. Here we show an close 4% per year, implying will occur, on average,...
The impact of ozone-depleting substances on global lower-stratospheric temperature trends is widely recognized. In the tropics, however, understanding has proven more challenging. While tropical cooling observed from 1979 to 1997 been linked ozone decreases, those cannot be chemical origin, as active chlorine not abundant in lower stratosphere. 1979–97 are believed originate enhanced upwelling, which, it often stated, would driven by increasing concentrations well-mixed greenhouse gases....
Abstract We examine the seasonal behavior of ozone by using measurements from various instruments including ozonesondes, Aura Microwave Limb Sounder, and Stratospheric Aerosol Gas Experiment II. find that magnitude annual variation in ozone, as a percentage mean exhibits maximum at or slightly above tropical tropopause. The is larger northern tropics than southern tropics, occurs 2 months later contrast to usual assumption can be treated horizontally homogeneous region. cycles other species...
The metamorphic model explaining orogenic gold ore formation has become widely accepted. However, there been extensive debate regarding whether a magmatic-hydrothermal system contributes fluids or metals in the source of deposits. Yidinan deposit is hosted by Triassic quartz diorite West Qinling Orogen, China, which controlled NNE-trending high-angle brittle-ductile faults. mineralization characterized vein and disseminated type ores comprising auriferous pyrite arsenopyrite. Magmatic...
Subseasonal forecast of Arctic sea ice has received less attention than the seasonal counterpart, as prediction skill dynamical models generally exhibits a significant drop in extended range (> 2 weeks). The predictability pan-Arctic concentration is evaluated by statistical using weekly time series for first time. Two models, vector auto-regressive model and Markov model, are predicting 1979–2014 (SIC) anomalies at subseasonal scale, combined information from ice, atmosphere ocean. slightly...
With global warming, glaciers in the high mountains of China are retreating rapidly. However, few data have been reported on whether greenhouse gases from these released into atmosphere or absorbed by glacial meltwater. In this study, we collected meltwater and ice samples Laohugou Glacier No. 12 western measured CH4 CO2 concentrations. Meltwater glacier terminus was continually sampled between 3 5 August 2020 to measure The results demonstrated that is a source because average saturations...