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Spatiotemporal Variability and Environmental Controls of Temperature Sensitivity of Ecosystem Respiration across the Tibetan Plateau

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Advances in Atmospheric Sciences 2024年第9期41卷 1821-1842页

作者： Danrui SHENG Xianhong MENG Shaoying WANG Zhaoguo LI lunyu shang Hao CHEN Lin ZHAO Mingshan DENG Hanlin NIU Pengfei XU Xiaohu WEN Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Zoige Plateau Wetlands Ecosystem Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Atmospheric Sciences Lanzhou UniversityLanzhou 730000China Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China

Warming-induced carbon loss via ecosystem respiration(R_(e))is probably intensifying in the alpine grassland ecosystem of the Tibetan Plateau owing to more accelerated warming and the higher temperature sensitivity of R_(e)(Q_(10)).However,little is known about the patterns and controlling factors of Q_(10)on the plateau,impeding the comprehension of the intensity of terrestrial carbon-climate feedbacks for these sensitive and vulnerable ***,we synthesized and analyzed multiyear observations from 14 sites to systematically compare the spatiotemporal variations of Q_(10)values in diverse climate zones and ecosystems,and further explore the relationships between Q_(10)and environmental ***,structural equation modeling was utilized to identify the direct and indirect factors predicting Q_(10)values during the annual,growing,and non-growing *** results indicated that the estimated Q_(10)values were strongly dependent on temperature,generally,with the average Q_(10)during different time periods increasing with air temperature and soil temperature at different measurement depths(5 cm,10 cm,20 cm).The Q_(10)values differentiated among ecosystems and climatic zones,with warming-induced Q_(10)declines being stronger in colder regions than elsewhere based on spatial *** was the most cardinal factor in predicting annual Q_(10)values,significantly and positively correlated with Q_(10).Soil temperature(Ts)was identified as the other powerful predictor for Q_(10),and the negative Q_(10)-Ts relationship demonstrates a larger terrestrial carbon loss potentiality in colder than in warmer regions in response to global *** that the interpretations of the effect of soil moisture on Q_(10)were complicated,reflected in a significant positive relationship between Q_(10)and soil moisture during the growing season and a strong quadratic correlation between the two during the annual and non-growing *** findings are conducive to imp

关键词： carbon cycle eddy covariance measurements ecosystem respiration Q_(10)value Tibetan Plateau climate change

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Bayesian-combined wavelet regressive modeling for hydrologic time series forecasting

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Chinese Science Bulletin 2013年第27期58卷 3796-3805页

作者： SANG YanFang shang lunyu WANG ZhongGen LIU ChangMing YANG ManGen Key Laboratory of Water Cycle & Related Land Surface Processes Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of Sciences Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Chinese Academy of Sciences School of Geographical Sciences Fujian Normal University

Wavelet regression(WR)models are used commonly for hydrologic time series forecasting,but they could not consider uncertainty *** this paper the AM-MCMC(adaptive Metropolis-Markov chain Monte Carlo)algorithm was employed to wavelet regressive modeling processes,and a model called AM-MCMC-WR was proposed for hydrologic time series *** AM-MCMC algorithm is used to estimate parameters’uncertainty in WR model,based on which probabilistic forecasting of hydrologic time series can be *** of two runoff data at the Huaihe River watershed indicate the identical performances of AM-MCMC-WR and WR models in gaining optimal forecasting result,but they perform better than linear regression *** from the WR model,probabilistic forecasting results can be gained by the proposed model,and uncertainty can be described using proper credible *** summary,parameters in WR models generally follow normal probability distribution;series’correlation characters determine the optimal parameters values,and further determine the uncertain degrees and sensitivities of parameters;more uncertain parameters would lead to more uncertain forecasting results and hard predictability of hydrologic time series.

关键词：时间序列预测水文时间序列回归建模小波线性回归模型贝叶斯 MCMC算法合并

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Dataset of Comparative Observations for Land Surface Processes over the Semi-Arid Alpine Grassland against Alpine Lakes in the Source Region of the Yellow River

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Advances in Atmospheric Sciences 2023年第6期40卷 1142-1157页

作者： Xianhong MENG Shihua LYU Zhaoguo LI Yinhuan AO Lijuan WEN lunyu shang Shaoying WANG Mingshan DENG Shaobo ZHANG Lin ZHAO Hao CHEN Di MA Suosuo LI Lele SHU Yingying AN Hanlin NIU Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Zoige Plateau Wetland Ecosystem Research Station Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China Plateau Atmosphere and Environment Key Laboratory of Sichuan Province School of Atmospheric SciencesChengdu University of Information TechnologyChengdu 610225China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjing 210044China University of Chinese Academy of Sciences Beijing 100049China

Thousands of lakes on the Tibetan Plateau(TP) play a critical role in the regional water cycle, weather, and climate. In recent years, the areas of TP lakes underwent drastic changes and have become a research hotspot. However, the characteristics of the lake-atmosphere interaction over the high-altitude lakes are still unclear, which inhibits model development and the accurate simulation of lake climate effects. The source region of the Yellow River(SRYR) has the largest outflow lake and freshwater lake on the TP and is one of the most densely distributed lakes on the TP. Since 2011,three observation sites have been set up in the Ngoring Lake basin in the SRYR to monitor the lake-atmosphere interaction and the differences among water-heat exchanges over the land and lake surfaces. This study presents an eight-year(2012–19), half-hourly, observation-based dataset related to lake–atmosphere interactions composed of three sites. The three sites represent the lake surface, the lakeside, and the land. The observations contain the basic meteorological elements,surface radiation, eddy covariance system, soil temperature, and moisture(for land). Information related to the sites and instruments, the continuity and completeness of data, and the differences among the observational results at different sites are described in this study. These data have been used in the previous study to reveal a few energy and water exchange characteristics of TP lakes and to validate and improve the lake and land surface model. The dataset is available at National Cryosphere Desert Data Center and Science Data Bank.

关键词： field observation dataset lake-atmosphere interaction energy and water exchanges the source region of the Yellow River Tibetan Plateau

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Estimation of Turbulent Fluxes Using the Flux-Variance Method over an Alpine Meadow Surface in the Eastern Tibetan Plateau

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Advances in Atmospheric Sciences 2013年第2期30卷 411-424页

作者： WANG Shaoying ZHANG Yu LU Shihua LIU Heping shang lunyu Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions Cold and Arid RegionsEnvironmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 Laboratory for Atmospheric Research Department of Civil and Environmental Engineering Washington State University Pullman WA

The flux-variance similarity relation and the vertical transfer of scalars exhibit dissimilarity over different types of surfaces, resulting in different parameterization approaches of relative transport efficiency among scalars to estimate turbulent fluxes using the flux-variance method. We investigated these issues using eddycovariance measurements over an open, homogeneous and flat grassland in the eastern Tibetan Plateau in summer under intermediate hydrological conditions during rainy season. In unstable conditions, the temperature, water vapor, and CO2 followed the flux-variance similarity relation, but did not show in precisely the same way due to different roles （active or passive） of these scalars. Similarity constants of temperature, water vapor and CO2 were found to be 1.12, 1.19 and 1.17, respectively. Heat transportation was more eft% cient than water vapor and CO2. Based on the estimated sensible heat flux, five parameterization methods of relative transport efficiency of heat to water vapor and CO2 were examined to estimate latent heat and CO2 fluxes. The strategy of local determination of flux-variance similarity relation is recommended for the estimation of latent heat and CO2 fluxes. This approach is better for representing the averaged relative transport efficiency, and technically easier to apply, compared to other more complex ones.

关键词： flux-variance method relative transfer efficiency eddy-covariance method homogeneous landsurface turbulent flux

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Radiation balance and the response of albedo to environmental factors above two alpine ecosystems in the eastern Tibetan Plateau

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Research in Cold and Arid Regions 2017年第2期9卷 142-150页

作者： ShaoYing Wang Yu Zhang ShiHua Lyu lunyu shang YouQi Su HanHui Zhu Key Laboratory of Land Surface and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gausu 730000 China College of Atmospheric Sciences Chendu University of Information Technology Chengdu Sichuan 610225 China

Understanding the energy balance on the Tibetan Plateau is important for better prediction of global climate change. To characterize the energy balance on the Plateau, we examined the radiation balance and the response of albedo to environmental factors above an alpine meadow and an alpine wetland surfaces in the eastern Tibetan Plateau, using 2014 data. Although our two sites belong to the same climatic background, and are close geographically, the annual incident solar radiation at the alpine meadow site(6,447 MJ/(m2·a)) was about 1.1 times that at the alpine wetland site(6,012 MJ/(m2·a)),due to differences in the cloudiness between our two sites. The alpine meadow and the alpine wetland emitted about 38%and 42%, respectively, of annual incident solar radiation back into atmosphere in the form of net longwave radiation; and they reflected about 22% and 18%, respectively, of the annual incident solar radiation back into atmosphere in the form of shortwave radiation. The annual net radiation was 2,648 and 2,544 MJ/(m2·a) for the alpine meadow site and the alpine wetland site, respectively, accounting for only about 40% of the annual incident solar radiation, significantly lower than the global mean. At 30-min scales, surface albedo exponentially decreases with the increase of the solar elevation angle; and it linearly decreases with the increase of soil-water content for our two sites. But those relationships are significantly influenced by cloudiness and are site-specific.

关键词： Tibetan Plateau radiation balance surface albedo solar elevation angle soil water content

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Winter estimation of surface roughness length over eastern Qinghai-Tibetan Plateau

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Research in Cold and Arid Regions 2017年第2期9卷 151-157页

作者： lunyu shang Yu Zhang ShiHua Lyu ShaoYing Wang YinHuan Ao SiQiong Luo ShiQiang Chen Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou Gansu 730000 China College of Atmospheric Science Chengdu University of Information Technology Chengdu Sichuan 610225 China

Based on the Monin-Obukhov similarity theory, a scheme was developed to calculate surface roughness length. Surface roughness length over the eastern Qinghai-Tibetan Plateau during the winter season was then estimated using the scheme and eddy covariance measurement data. Comparisons of estimated and measured wind speeds show that the scheme is feasible to calculate surface roughness length. The estimated roughness lengths at the measurement site during unfrozen,frozen and melted periods are 3.23×10-3, 2.27×10-3 and 1.92×10-3 m, respectively. Surface roughness length demonstrates a deceasing trend with time during the winter season. Thereby, setting the roughness length to be a constant value in numerical models could lead to certain degree of simulation errors. The variation of surface roughness length may be caused by the change in land surface characteristic.

关键词： Qinghai-Tibetan Plateau surface roughness length Monin-Obukhov similarity theory least square fitting

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An improvement of soil temperature simulations on the Tibetan Plateau

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Research in Cold and Arid Regions 2018年第1期10卷 80-94页

作者： SiQiong Luo BoLi Chen ShiHua Lyu XueWei Fang JingYuan Wang XianHong Meng lunyu shang ShaoYing Wang Di Ma Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China Changzhou Meteorological Bureau ChangzhouJiangsu 213000China School of Atmospheric Sciences Plateau Atmosphere and Environment Key Laboratory of Sichuan ProvinceChengdu University of Information TechnologyChengduSichuan 610225China Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters Nanjing University of Information Science and TechnologyNanjingJiangsu 210044China

The simulation of soil temperature on the Tibetan Plateau(TP) plays a dominant role in the performance of both global climate and numerical weather forecast models. To improve the simulation of soil temperature on the TP, the Johansen soil thermal conductivity parameterization scheme was introduced into Community Land Model 3.5(CLM3.5) and Regional Climatic Model 4(Reg CM4). The improved CLM3.5 and Reg CM4-CLM were utilized to conduct offline and regional simulation experiments on the TP. Comparison of the new and old schemes revealed that CLM3.5 provides high thermal conductivity parameters of mineral soil solid on the TP. The Johansen scheme is more practical for the TP than the soil thermal conductivity parameterization in CLM3.5. The simulation of soil temperature and liquid water content was improved in offline experiment. The improved parameterization scheme can also reduce the simulation error of soil temperature in winter throughout the entire TP.

关键词： soil temperature soil thermal conductivity parameterization scheme Tibetan Plateau CLM3.5 RegCM4

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青藏高原土壤冻融对地表辐射特征的影响分析

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太阳能学报 2010年第1期31卷 12-16页

作者：尚伦宇吕世华李锁锁孟宪红奥银焕中国科学院寒区旱区环境与工程研究所西部气候环境与灾害实验室兰州730000

利用黄河源区气候与环境综合观测研究站.2006年10月1日～2007年4月30日的辐射和5cm土壤温度和湿度资料研究了土壤冻融对地表辐射特征的影响,结果表明:土壤冻结降低了土壤中的液态水含量,致使冻结阶段地表反照率大于冻结前的值,也大于土... 详细信息

利用黄河源区气候与环境综合观测研究站.2006年10月1日～2007年4月30日的辐射和5cm土壤温度和湿度资料研究了土壤冻融对地表辐射特征的影响,结果表明:土壤冻结降低了土壤中的液态水含量,致使冻结阶段地表反照率大于冻结前的值,也大于土壤融化后的值;受总辐射和地表反照率共同作用,整个冻融过程中反射辐射可区分为两个比较明显的阶段;土壤冻结减缓了地表温度降低的速率,相应地减缓了地表长波辐射和大气逆辐射降低的速率;整个冻融过程中净辐射变化与总辐射的变化比较相近,在冻结阶段,地表反照率大于冻结前的值,也大于融化后的值,因此冻结阶段的净辐射值也更小一些。

关键词：青藏高原土壤冻融反照率地表辐射特征

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WRF模式对金塔绿洲-戈壁辐射收支的模拟研究

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太阳能学报 2011年第3期32卷 346-353页

作者：文小航吕世华尚伦宇奥银焕鲍艳李万莉中国科学院寒区旱区环境与工程研究所寒旱区陆面过程与气候变化重点实验室兰州730000

利用WRF中尺度气象模式结合卫星反演的下垫面土地利用/植被类型资料对夏季金塔绿洲辐射和能量传输过程进行模拟,并用2008年"绿洲系统非均匀下垫面能量水分交换和边界层过程观测与理论研究"加强期外场试验所取得观测资料进行验证。结果表... 详细信息

利用WRF中尺度气象模式结合卫星反演的下垫面土地利用/植被类型资料对夏季金塔绿洲辐射和能量传输过程进行模拟,并用2008年"绿洲系统非均匀下垫面能量水分交换和边界层过程观测与理论研究"加强期外场试验所取得观测资料进行验证。结果表明:晴天状况下WRF模式能较好地模拟出辐射各分量和热流密度的变化,阴天和雨天次之;向下长波辐射以外的各辐射分量观测值与模拟值的相关性很好,相关系数都在0.9以上,均方根偏差在86.6W.m-2以下,平均绝对误差都在24%以下;绿洲能量传输主要为潜热输送,戈壁为感热输送;绿洲潜热、感热和地表热流密度分别占净全辐射的87.1%、9.1%和11.1%,研究结果可为合理配置绿洲太阳辐射资源提供参考。

关键词：金塔绿洲 WRF模式辐射收支能量平衡

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玛曲高寒草甸夏季近地层微气象和CO_2通量特征分析

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冰川冻土 2019年第1期41卷 54-63页

作者：张懿文小航王少影尚伦宇张宇成都信息工程大学大气科学学院高原大气与环境四川省重点实验室四川成都610225 广安市环境监测站四川广安638000 北京师范大学珠海分校珠海区域气候-环境-生态预测预警协同创新中心广东珠海519087 中国科学院西北生态环境资源研究院寒旱区陆面过程与气候变化重点实验室甘肃兰州730000

利用2015年夏季玛曲高寒草甸观测资料,从中选取7月10个连续完整的观测日,分析了近地层气象要素、地表辐射和能量传输以及CO_2通量日变化特征。结果表明:夏季玛曲地区气温和比湿昼夜差异较大,最大温差为19.2℃,平均风速为2.7 m·s^(-1),... 详细信息

利用2015年夏季玛曲高寒草甸观测资料,从中选取7月10个连续完整的观测日,分析了近地层气象要素、地表辐射和能量传输以及CO_2通量日变化特征。结果表明:夏季玛曲地区气温和比湿昼夜差异较大,最大温差为19.2℃,平均风速为2.7 m·s^(-1),风向以东风为主。晴天条件下向下短波辐射可达1 200 W·m^(-2)左右,平均地表反照率为0.22,均大于藏北那曲地区。净辐射峰值可达850 W·m^(-2)左右,陆-气间能量传输以潜热输送为主。10 d能量闭合度平均值为0.61,能量不平衡程度较大。夏季玛曲高寒草甸表现为"碳汇", CO_2通量平均值为-0.20 mg·m^(-2)·s^(-1),晴天碳吸收最大速率为-14.05 mg·m^(-2)·s^(-1),显著大于阴天,最大碳吸收时长为13 h, CO_2密度平均值为530.7 mg·m^(-3)。

关键词：黄河源区高寒草甸能量平衡 CO2通量

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