Subtopic 1: detailed simulation and analysis of climate change

Leader: Xuejie Gao, Youcun Qi

Participating Units: 

Institute of Atmospheric Physics, CAS; 

Institute of Geographical Sciences and Resources, CAS; 

Qinghai Tibet Plateau Institute, CAS; 

Beijing Normal University; 

Southern University of Science and Technology; 

University of Gothenburg, Sweden

The research progresses are as follows: 

1. Collect, sort out and analyze the observation and simulation data of the pan-third pole and southeast Asia;

1.1 Precipitation data of lattice plane;

1.2 Data of ground observation stations;

1.3 Satellite radar observation data;

1.4 Reanalysis data: European center for medium term weather forecasts (ECMWF) ERA5 et al;

1.5 Regional large-scale atmospheric circulation index data (ENSO, PDO), monsoon index, tropical cyclone track record, drought index data, etc.;

1.6 CMIP5 multi-mode simulation prediction data;

1.7 Construction of Bayesian multi-mode set average method and related programs and software.

2. Analysis and research on hydrological and climatic characteristics of the pan-third pole region.

2.1 Research on precipitation characteristics of the Qinghai Tibet plateau has been completed, including the monthly precipitation contribution, frequency of different type of rainfall as well as contribution.

Contribution and occurrence frequency of different types of precipitation in Qinghai Tibet Plateau.

a. Contribution of monthly precipitation,     b. Occurrence frequency of different types of precipitation,     c. Contribution of different types of precipitation

2.2 Precipitation datasets quality assessment

For PERSIANN-CDR，TRMM, CFSR，ERA-Interim，as well as MERRA2 in the Mekong River Basin.

Precipitation data from 1998-2007 in the Mekong River Basin, unit: mm

a. annual average, b. seasonal circulation, c. the contribution of the precipitation every month to the annual average. 

1983-2016 annual precipitation’s distribution unit:mm

a. annual average,     b. annual average rainfall in tropical cyclone,     c. the contribution of the rainfall in the tropical cyclone. 

3. Installation, debugging, simulation and test results of regional climate models WRF and RegCM4

3.1 WRF 3.7.1, with the horizontal resolution 9km times 9km, 60 layers vertically, driven by ERA5, the spectral approximation techniques were applied.

3.2 RegCM4, with the horizontal resolution 25km times 25km, 18 layers vertically. The CORDEX-EA region was used to determine the simulation scheme setting, update the model vegetation and surface emissivity data, etc. through testing, and conducted the long-term simulation test under the ERA-interim drive.

Here is the published papers and datasets.

SCI paper for precipitation datasets quality assessment.

Chen et al., 2018. Assessing reliability of precipitation data over the Mekong River Basin: A comparison of ground-based, satellite, and reanalysis datasets. International Journal of Climatology, doi: 10.1002/joc.5670

SCI paper for analysis of regional tropical cyclone precipitation and its influence

Chen et al., Tropical cyclone rainfall in the Mekong River Basin for 1983-2016. Submitted

SCI paper on dynamic downscaling simulation of precipitation on qinghai-tibet plateau

Ou et al., Impact of high-resolution global reanalysis on precip itation dynamical downscaling over the Tibetan Plateau. In preparation

Qinghai-Tibet Plateau observation, reanalysis and CMIP5 multi-model prediction dataset

WRF model high spatial and temporal resolution simulated data set of Qinghai Tibet plateau

RegCM4 east Asian regional simulation’s recommended Settings and simulated data mode versions

RegCM4 east Asian regional simulation data set

Multipattern set average method to build the program code

Others:

Discussion and coordination of related work among sub-topics were through email, teleconferencing and small meetings;

All the researchers communicated closely with other related subjects/sub-subjects in the project, such as coordination of RCM related simulation;

Co-hosted international conference (Vientiane, Laos, August 2018, "land cover/land use change and water-energy-food nexus in southeast Asia");

Carried out extensive domestic and international exchanges and cooperation around sub-tasks;

Personnel team construction: key research personnel of sub-research groups have been in place;

Existing problems and improvement measures: none.