scholarly journals Evaluation of Groundwater Storage Variations Estimated from GRACE Data Assimilation and State-of-the-Art Land Surface Models in Australia and the North China Plain

2018 ◽  
Vol 10 (3) ◽  
pp. 483 ◽  
Author(s):  
Natthachet Tangdamrongsub ◽  
Shin-Chan Han ◽  
Siyuan Tian ◽  
Hannes Müller Schmied ◽  
Edwin H. Sutanudjaja ◽  
...  
Keyword(s):  
Data Assimilation ◽  
Land Surface ◽  
North China Plain ◽  
North China ◽  
State Of The Art ◽  
Land Surface Models ◽  
The North ◽  
The North China Plain ◽  
Grace Data ◽  
Surface Models

scholarly journals Evaluation of Eight Current Reanalyses in Simulating Land Surface Temperature from 1979 to 2003 in China

2017 ◽  
Vol 30 (18) ◽  
pp. 7379-7398 ◽  
Author(s):  
Chunlüe Zhou ◽  
Kaicun Wang ◽  
Qian Ma
Keyword(s):  
Tibetan Plateau ◽  
Land Surface ◽  
North China Plain ◽  
North China ◽  
Northwest China ◽  
Warming Trend ◽  
The Tibetan Plateau ◽  
Precipitation Frequency ◽  
The North ◽  
The North China Plain

Abstract Land surface temperature Ts provides essential supplementary information to surface air temperature, the most widely used metric in global warming studies. A lack of reliable observational Ts data makes assessing model simulations difficult. Here, the authors first examined the simulated Ts of eight current reanalyses based on homogenized Ts data collected at ~2200 weather stations from 1979 to 2003 in China. The results show that the reanalyses are skillful in simulating the interannual variance of Ts in China (r = 0.95) except over the Tibetan Plateau. ERA-Interim and MERRA land versions perform better in this respect than ERA-Interim and MERRA. Observations show that the interannual variance of Ts over the north China plain and south China is mostly influenced by surface incident solar radiation Rs, followed by precipitation frequency, whereas the opposite is true over the northwest China, northeast China, and the Tibetan Plateau. This variable relationship is well captured by ERA-Interim, ERA-Interim land, MERRA, and JRA-55. The homogenized Ts data show a warming of 0.34°C decade−1 from 1979 to 2003 in China, varying between 0.25° and 0.42°C decade−1 for the eight reanalyses. However, the reanalyses substantially underestimate the warming trend of Ts over northwest China, northeast China, and the Tibetan Plateau and significantly overestimate the warming trend of Ts over the north China plain and south China owing to their biases in simulating the Rs and precipitation frequency trends. This study provides a diagnostic method for examining the capability of current atmospheric/land reanalysis data in regional climate change studies.

scholarly journals Effects of groundwater pumping on ground surface temperature: A regional modeling study in the North China Plain

2020 ◽  
Author(s):  
You-Kuan Zhang ◽  
Chen Yang ◽  
Xiaofan Yang
Keyword(s):  
Surface Temperature ◽  
Land Surface ◽  
North China Plain ◽  
North China ◽  
Ground Surface ◽  
Temporal Variations ◽  
Heat Fluxes ◽  
Ground Surface Temperature ◽  
The North ◽  
The North China Plain

<p>It is recognized that groundwater (GW) may play an important role in the subsurface–land-surface–atmosphere system and that pumping of GW may affect soil moisture which in turn influences local weather and climate through land-atmosphere interactions. In this study effects of GW pumping on ground surface temperature (GST) in the North China Plain (NCP) were investigated with a coupled ParFlow.CLM model of subsurface and land-surface processes and their interactions. The model was validated using the water and energy fluxes reported in previous studies and from the JRA-55 reanalysis. Numerical experiments were designed to examine the impacts of GW pumping and irrigation on GST. Results show significant effects of GW pumping on GST in the NCP. Generally, the subsurface acts as a buffer to temporal variations in heat fluxes at the land-surface, but long-term pumping can gradually weaken this buffer, resulting in increases in the spatio-temporal variability of GST, as exemplified by hotter summers and colder winters. Considering that changes of water table depth (WTD) can significantly affect land surface heat fluxes when WTD ranges between 1–10 m, the 0.5 m/year increase of WTD simulated by the model due to pumping can continue to raise GST for about 20 years from the pre-pumping WTD in the NCP. The increase of GST is expected to be faster initially and gradually slow down. The findings from this study may implicate similar GST increases may occur in other regions with GW depletion.</p>

scholarly journals Lidar vertical observation network and data assimilation reveal key processes driving the 3-D dynamic evolution of PM<sub>2.5</sub> concentrations over the North China Plain

2021 ◽  
Vol 21 (9) ◽  
pp. 7023-7037
Author(s):  
Yan Xiang ◽  
Tianshu Zhang ◽  
Chaoqun Ma ◽  
Lihui Lv ◽  
Jianguo Liu ◽  
...  
Keyword(s):  
Air Pollution ◽  
Data Assimilation ◽  
North China Plain ◽  
North China ◽  
Three Dimensions ◽  
Air Pollution Control ◽  
The North ◽  
The North China Plain ◽  
Observation Network ◽  
Pm2.5 Concentration

Abstract. China has made great efforts to monitor and control air pollution in the past decade. Comprehensive characterization and understanding of pollutants in three-dimensions are, however, still lacking. Here, we used data from an observation network consisting of 13 aerosol lidars and more than 1000 ground observation stations combined with a data assimilation technique to conduct a comprehensive analysis of extreme heavy aerosol pollution (HAP) over the North China Plain (NCP) from November–December 2017. During the studied period, the maximum hourly mass concentration of surface PM2.5 reached ∼390 µg m−3. After assimilation, the correlation between model results and the independent observation sub-dataset was ∼50 % higher than that without the assimilation, and the root mean square error was reduced by ∼40 %. From pollution development to dissipation, we divided the HAP in the NCP (especially in Beijing) into four phases: an early phase (EP), a transport phase (TP), an accumulation phase (AP), and a removal phase (RP). We then analyzed the evolutionary characteristics of PM2.5 concentration during different phases on the surface and in 3-D space. We found that the particles were mainly transported from south to north at a height of 1–2 km (during EP and RP) and near the surface (during TP and AP). The amounts of PM2.5 advected into Beijing with the maximum transport flux intensity (TFI) were through the pathways in the relative order of the southwest > southeast > east pathways. The dissipation of PM2.5 in the RP stage (with negative TFI) was mainly from north to south with an average transport height of ∼1 km above the surface. Our results quantified the multi-dimensional distribution and evolution of PM2.5 concentration over the NCP, which may help policymakers develop efficient air pollution control strategies.

Improved water storage estimates within the North China Plain by assimilating GRACE data into the CABLE model

2020 ◽  
Vol 590 ◽  
pp. 125348 ◽  
Author(s):  
Wenjie Yin ◽  
Shin-Chan Han ◽  
Wei Zheng ◽  
In-Young Yeo ◽  
Litang Hu ◽  
...  
Keyword(s):  
North China Plain ◽  
North China ◽  
Water Storage ◽  
Cable Model ◽  
The North ◽  
The North China Plain ◽  
Grace Data
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