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| 1 | Geographical characteristics of China’s wetlands derived from remotely sensed data显示文摘In this paper, we report the first wetland mapping of the entire China using Landsat enhanced thematic mapper plus (ETM+) data. These data were obtained from the Global Land Cover Facility at the University of Maryland spanning from 1999 to 2002. A total of 597 scenes of Landsat images were georeferenced and mosaiced. Manual image interpretation of satellite images was aided with elevation data, soil data, land cover/land use data and Google Earth. The minimum mapping unit is 10 pixel × 10 pixel, equivalent to 9 ha. The aim of our first round of mapping was only targeted at the boundary delineation of any type of wetland except those wetlands that are under agricultural use (i.e., paddy fields), which has already been well mapped by others. Our interpretation results indicate that a total of 359478 km2 of wetlands are of non-agricultural use. Among our preliminarily mapped wetland, 339353 km2 are inland wetland, 2786 km2 are non-agricultural artificial wetland, and 17609 km2 are coastal wetland. Because low-tide is rarely captured in satellite images, an under-estimation of coastal wetland is inevitable. We conducted some statistics based on our mapped wetlands and compared them with those previously obtained from a number of sources including a land cover/land use map made with satellite images during the late 1990s and early 2000s, a marshland map developed in approximately the same period, survey data of coastal wetland in early 1980s, and area data for approximately 400 larger patches of marshland in China compiled in 1996. Because some inconsistencies exist in the guidelines of those different wetland surveys, difference in area is expected. Some further comparison indicates that the wetland distributions derived from the preliminary wetland map are reasonable and more objective than other sources. The mapping process also indicated that the method adopted by us was efficient and cost-effective. We also found that in order to ensure comparability of the wetland maps developed at different times, a set of standard guidelines on the wetland categories to be mapped, and the mapping methods to be used must be well conceived, developed and effectively employed. We carried out some initial geographical analysis on the distribution of wetlands. | NIU ZhenGuo GONG Peng CHENG Xiao GUO JianHong WANG Lin HUANG HuaBing SHEN ShaoQing WU YunZhao WANG XiaoFeng WANG XianWei YING Qing LIANG Lu ZHANG LiNa WANG Lei YAO Qian YANG ZhenZhong GUO ZiQi DAI YongJiu | 2009 | Science China Earth Sciences2009，52，6： | 15 |
| 2 | Preliminary estimation of the organic carbon pool in China's wetlands显示文摘Accurate estimation of wetland carbon pools is a prerequisite for wetland resource conservation and implementation of carbon sink enhancement plans.The inventory approach is a realistic method for estimating the organic carbon pool in China's wetlands at the national scale.An updated data and inventory approach were used to estimate the amount of organic carbon stored in China's wetlands.Primary results are as follows:(1) the organic carbon pool of China's wetlands is between 5.39 and 7.25 Pg,accounting for 1.3%-3.5% of the global level;(2) the estimated values and percentages of the organic carbon contained in the soil,water and vegetation pools in China's wetlands are 5.04-6.19 Pg and 85.4%-93.5%,0.22-0.56 Pg and 4.1%-7.7%,0.13-0.50 Pg and 2.4%-6.9%,respectively.The soil organic carbon pool of China's wetlands is greater than our previous estimate of 3.67 Pg,but is lower than other previous estimates of 12.20 and 8-10 Pg.Based on the discussion and uncertainty analysis,some research areas worthy of future attention are presented. | ZHENG YaoMin NIU ZhenGuo GONG Peng DAI YongJiu SHANGGUAN Wei | 2013 | Chinese Science Bulletin2013，58，6： | 13 |
| 3 | Monitoring dynamic changes of global land cover types:fluctuations of major lakes in China every 8 days during 2000–2010显示文摘Remote sensing images can be used to delineate variations in the area of lakes and to assess the influence of environmental changes and human activities.However,because lakes are dynamic,results obtained from individual images acquired on a single date are not representative and do not accurately reflect ongoing changes.In this study,we used 8-day moderate resolution imaging spectroradiometer(MODIS)composite data from 2000 to2010 to map water surface changes over 629 lakes in China.We combined automatic extraction of training data and support vector machine classification to derive the spatial distribution of these large water bodies.The producer’s and user’s accuracies for MODIS images were91.06%and 89.81%,respectively,when compared with interpretation results from 30 m resolution Landsat images taken on similar days.Area changes,variability,inundation intensity,and rainy seasons of the 629 lakes were analyzed based on this multi-temporal lake database.The total area of the 629 lakes increased over the study period,primarily as a result of the expansion of lake areas on the Tibetan Plateau.There were 12 lakes with a maximum area[1,000 km2,and six of these decreased in area from 2000to 2010.The shrinkages of Poyang Lake and Dongting Lake were-54.76 and-25.08 km2/a,respectively.The area of lakes on Tibetan Plateau,in northern Xinjiang,northeastern Inner Mongolia,and northeastern China varied little,while lakes on the Yangtze Plain,in southern Inner Mongolia,and central Xinjiang fluctuated considerably.Inundation intensity increased for lakes on the Tibetan Plateau,in northern Xinjiang,Heilongjiang,and Jilin,while inundation extent decreased in central Xinjiang,southern Tibet,southern Inner Mongolia,Sichuan,and on the Yangtze Plain.This study is an attempt to develop high-frequency specific land cover maps to improve applicability of general land cover maps.The lake products serve as an important supplement to hydrologic data.The lake database enables the generation of new land surface process models,which could improve the precision of simulations,based on more accurate observations of dynamic lake systems. | Fangdi Sun Yuanyuan Zhao Peng Gong Ronghua Ma Yongjiu Dai | 2014 | Chinese Science Bulletin2014，59，2： | 10 |
| 4 | Evaluation of the New Dynamic Global Vegetation Model in CAS-ESM显示文摘In the past several decades, dynamic global vegetation models(DGVMs) have been the most widely used and appropriate tool at the global scale to investigate vegetation-climate interactions. At the Institute of Atmospheric Physics, a new version of DGVM(IAP-DGVM) has been developed and coupled to the Common Land Model(CoLM) within the framework of the Chinese Academy of Sciences' Earth System Model(CAS-ESM). This work reports the performance of IAP-DGVM through comparisons with that of the default DGVM of CoLM(CoLM-DGVM) and observations. With respect to CoLMDGVM, IAP-DGVM simulated fewer tropical trees, more 'needleleaf evergreen boreal tree' and 'broadleaf deciduous boreal shrub', and a better representation of grasses. These contributed to a more realistic vegetation distribution in IAP-DGVM,including spatial patterns, total areas, and compositions. Moreover, IAP-DGVM also produced more accurate carbon fluxes than CoLM-DGVM when compared with observational estimates. Gross primary productivity and net primary production in IAP-DGVM were in better agreement with observations than those of CoLM-DGVM, and the tropical pattern of fire carbon emissions in IAP-DGVM was much more consistent with the observation than that in CoLM-DGVM. The leaf area index simulated by IAP-DGVM was closer to the observation than that of CoLM-DGVM; however, both simulated values about twice as large as in the observation. This evaluation provides valuable information for the application of CAS-ESM, as well as for other model communities in terms of a comparative benchmark. | Jiawen ZHU Xiaodong ZENG Minghua ZHANG Yongjiu DAI Duoying JI Fang LI Qian ZHANG He ZHANG Xiang SONG | 2018 | Advances in Atmospheric Sciences2018，35，6： | 6 |
| 5 | Evaluating Common Land Model Energy Fluxes Using FLUXNET Data显示文摘Given the crucial role of land surface processes in global and regional climates, there is a pressing need to test and verify the performance of land surface models via comparisons to observations. In this study, the eddy covariance measurements from 20 FLUXNET sites spanning more than 100 site-years were utilized to evaluate the performance of the Common Land Model(Co LM) over different vegetation types in various climate zones. A decomposition method was employed to separate both the observed and simulated energy fluxes, i.e., the sensible heat flux, latent heat flux, net radiation, and ground heat flux, at three timescales ranging from stepwise(30 min) to monthly. A comparison between the simulations and observations indicated that Co LM produced satisfactory simulations of all four energy fluxes, although the different indexes did not exhibit consistent results among the different fluxes. A strong agreement between the simulations and observations was found for the seasonal cycles at the 20 sites, whereas Co LM underestimated the latent heat flux at the sites with distinct dry and wet seasons, which might be associated with its weakness in simulating soil water during the dry season. Co LM cannot explicitly simulate the midday depression of leaf gas exchange, which may explain why Co LM also has a maximum diurnal bias at noon in the summer. Of the eight selected vegetation types analyzed, Co LM performs best for evergreen broadleaf forests and worst for croplands and wetlands. | Xiangxiang ZHANG Yongjiu DAI Hongzhi CUI Robert E.DICKINSON Siguang ZHU Nan WEI Binyan YAN Hua YUAN Wei SHANGGUAN Lili WANG Wenting FU | 2017 | Advances in Atmospheric Sciences2017，34，9： | 4 |
| 6 | Mapping Near-surface Air Temperature, Pressure, Relative Humidity and Wind Speed over China's Mainland with High Spatiotemporal Resolution显示文摘As part of a joint effort to construct an atmospheric forcing dataset for China's Mainland with high spatiotemporal resolution, a new approach is proposed to construct gridded near-surface temperature, relative humidity, wind speed and surface pressure with a resolution of 1 km×1 km. The approach comprises two steps:(1) fit a partial thin-plate smoothing spline with orography and reanalysis data as explanatory variables to ground-based observations for estimating a trend surface;(2)apply a simple kriging procedure to the residual for trend surface correction.The proposed approach is applied to observations collected at approximately 700 stations over China's Mainland. The generated forcing fields are compared with the corresponding components of the National Centers for Environmental Prediction(NCEP) Climate Forecast System Reanalysis dataset and the Princeton meteorological forcing dataset. The comparison shows that, both within the station network and within the resolutions of the two gridded datasets, the interpolation errors of the proposed approach are markedly smaller than the two gridded datasets. | LI Tao ZHENG Xiaogu DAI Yongjiu YANG Chi CHEN Zhuoqi ZHANG Shupeng WU Guocan WANG Zhonglei HUANG Chengcheng SHEN Yan LIAO Rongwei | 2014 | Advances in Atmospheric Sciences2014，31，5： | 3 |
| 7 | Assessment of global meteorological,hydrological and agricultural drought under future warming based on CMIP6显示文摘在全球变暖背景下,分析和预测干旱的变化趋势和传播规律对于区域生态环境安全和灾害管理具有重要意义.本文基于第六次国际耦合模式比较计划(CMIP6),分析了SSP2-4.5和SSP5-8.5两种变暖情景下的气象(标准化降水指数SPI和标准化降水蒸发指数SPEI),水文(标准化径流指数SRI)和农业(标准化土壤水分指数SSI)干旱情况.从1901年到2100年,全球范围内不同类型的干旱事件普遍都表现出空间范围,持续时间和严重程度上的增长,其中SPEI干旱的增长最为显著.干旱加剧的地区主要包括美国西南部,亚马逊地区,地中海地区,非洲南部,亚洲南部和澳大利亚.尽管结果显示SRI和SSI干旱程度强于SPI干旱,但不同模式对SPI干旱的预测具有更高的一致性.此外,研究发现气象干旱与水文干旱的相关性高于气象干旱与农业干旱的相关性,在温暖湿润地区尤为明显,同时水文干旱与短时间尺度的气象干旱具有更好的相关性.本文的研究结果将有助于气候变化下的干旱监测和水资源管理. | Jianxin Zeng Jiaxian Li Xingjie Lu Zhongwang Wei Wei Shangguan Shupeng Zhang Yongjiu Dai Shulei Zhang | 2022 | Atmospheric and Oceanic Science Letters2022，15，1： | 2 |
| 8 | Develop-ment of a China dataset of soil hydraulic parameters using pedo- transfer functions for land surface modeling 显示文摘 | Dai Yongjiu Shangguan Wei Duan Qingyun | 2013 | Journal of Hydrometeorology2013，14，3： | 1 |
| 9 | The common land model显示文摘 | Yongjiu Dai Xubin Zeng Robert E Dickinson | 2003 | Bull Amer Meteor Soc2003，，8： | 1 |
| 10 | Reprocessing the MODIS Leaf Area Index products for land surface and climate modelling显示文摘 | Hua Yuan Yongjiu Dai Zhiqiang Xiao Duoying Ji Wei Shangguan | 2011 | Remote Sensing of Environment2011，，5： | 1 |
| 11 | The Common Land Model显示文摘 | Dai Yongjiu Zeng X Dickinson R E | 2003 | Bulletin of the American Meteorological So- ciety2003，84，8： | 1 |
| 12 | The common land model显示文摘 | Dai Yongjiu Zeng Xubin R E Dickinson | 2003 | Bull Amer Meteor Soc2003，84，： | 1 |
| 13 | A land surface model (IAP94) for climate studies, Part I: formulation and validation in off-line experiments显示文摘 | Dai Yongjiu Zeng Qingcun | 1997 | Advances in Atmospheric Sciences1997，14，： | 1 |
| 14 | l'qumencal sHnm:uon u: : soil water equation显示文摘 | Xie Zhenghui Zeng Qingcun Dai Yongjiu | 1998 | Science in China (series D)1998，41，4： | 1 |
| 15 | Au application of the mass-ktmped finite element method to the unsaturated soil water problem显示文摘 | Xie Zhenghui Zeng Qingcun Dai Yongjiu | 1998 | Studies in Climate and Environ- ment1998，3，1： | 1 |
| 16 | Validation of IAP94 land surface model over the Huaihe River Basin with H UBEX field experiment data显示文摘 | Yang Xiaosong Lin Chaohui Dai Yongjiu | 2001 | Adv Atmos Sci2001，18，1： | 1 |
| 17 | The common land model 显示文摘 | Dai Yongjiu Zeng Xubin Dickinson R E | 2003 | Bulletin of the American Meteorological Society2003，84，8： | 1 |
| 18 | Coupling of the common land model to the NCAR community climate model显示文摘 | ZENG Xubin Shaikh Muhammad Dai Yongjiu et 81 | 2001 | Journal of Climate2001，15，： | 1 |
| 19 | The common land model 显示文摘 | Dai Yongjiu Zeng Xubin Dickinson R E | 2003 | Bulletin of the American Meteorological Society2003，84，： | 1 |
| 20 | The Common Land Model显示文摘 | Dai Yongjiu Xubin Zeng Rober E Dickinson | 2003 | Bull Amer Meteor Soc2003，84，8： | 1 |
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