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2022年1月15日,南太平洋汤加海底火山发生剧烈喷发。为了探测此次火山爆发引起的异常环境响应,利用GPS电离层数据,引入滑动四分位距法探测电离层异常扰动,结果显示：火山爆发前第22天到第27天,总电子含量出现大面积的正异常现象,部分时刻的异常超过10TECU。在火山爆发前第16天、前第10天和前第1天均出现了较轻微的负异常现象,异常均小于5TECU,其中火山爆发前第25~27天的TEC异常可能是由于太阳活动引起的。以上结果表明本研究成功利用GPS技术探测到此次火山爆发过程中的异常环境响应。 相似文献
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本文以贵阳市为研究对象,研究了地表覆盖组分及植被多样性对地表温度的影响。首先基于Landsat8 OLI多时相影像数据在GEE平台上实现了研究区域地表覆盖精细分类;然后结合不同季节8天合成的MODIS温度产品数据,利用时空统计分析、相关分析等方法分析了研究区不同地表覆盖类型地表温度时空分布特征,地表温度与不同地表覆盖组分、地表覆盖多样性和植被覆盖多样性的相关性。结果表明：贵阳市建成区主要分布有常绿阔叶林、常绿针叶林等植被,常绿阔叶林在不同季节对地表温度的降温效应明显,而不透水面对地表温度具有明显的增温效应,尤其以夏季最为显著;地表覆盖多样性与地表温度之间具有较强相关性,其中植被覆盖多样性较植被覆盖率对地表温度的影响更为显著,而不透水面的增加会明显降低植被多样性的影响。因此,要发挥城市绿地对城市温度和热岛效应的调节作用,建议可以适当增加常绿阔叶林的绿化面积,同时在空间上要提升植被多样性水平,能够较大程度改善城市热环境。 相似文献
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东中国海碳循环时空变化特征:三维物理-生物地球化学数值模型研究 总被引：1，自引：1，他引：0
In the east of China's seas, there is a wide range of the continental shelf. The nutrient cycle and the carbon cycle in the east of China's seas exhibit a strong variability on seasonal to decadal time scales. On the basis of a regional ocean modeling system(ROMS), a three dimensional physical-biogeochemical model including the carbon cycle with the resolution(1/12)°×(1/12)° is established to investigate the physical variations, ecosystem responses and carbon cycle consequences in the east of China's seas. The ROMS-Nutrient Phytoplankton Zooplankton Detritus(NPZD) model is driven by daily air-sea fluxes(wind stress, long wave radiation, short wave radiation, sensible heat and latent heat, freshwater fluxes) that derived from the National Centers for Environmental Prediction(NCEP) reanalysis2 from 1982 to 2005. The coupled model is capable of reproducing the observed seasonal variation characteristics over the same period in the East China Sea. The integrated air-sea CO_2 flux over the entire east of China's seas reveals a strong seasonal cycle, functioning as a source of CO_2 to the atmosphere from June to October, while serving as a sink of CO_2 to the atmosphere in the other months. The 24 a mean value of airsea CO_2 flux over the entire east of China's seas is about 1.06 mol/(m~2·a), which is equivalent to a regional total of3.22 Mt/a, indicating that in the east of China's seas there is a sink of CO_2 to the atmosphere. The partial pressure of carbon dioxide in sea water in the east of China's seas has an increasing rate of 1.15 μatm/a(1μtm/a=0.101 325Pa), but p H in sea water has an opposite tendency, which decreases with a rate of 0.001 3 a~(–1) from 1982 to 2005.Biological activity is a dominant factor that controls the pCO_2 air in the east of China's seas, and followed by a temperature. The inverse relationship between the interannual variability of air-sea CO_2 flux averaged from the domain area and Ni?o3 SST Index indicates that the carbon cycle in the east of China's seas has a high correlation with El Ni?o-Southern Oscillation(ENSO). 相似文献
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中国近海生态动力学模型参数敏感性研究 总被引：3，自引：2，他引：1
In order to develop a coupled basin scale model of ocean circulation and biogeochemical cycling,we present a biogeochemical model including 12 components to study the ecosystem in the China coastal seas(CCS).The formulation of phytoplankton mortality and zooplankton growth are modified according to biological characteristics of CCS.The four sensitivity biological parameters,zooplankton assimilation efficiency rate(ZooAE_N),zooplankton basal metabolism rate(ZooBM),maximum specific growth rate of zooplankton(μ_(20)) and maximum chlorophyll to carbon ratio(Chl2C_m) are obtained in sensitivity experiments for the phytoplankton,and experiments about the parameter μ_(20'),half-saturation for phytoplankton NO_3 uptake(K_(NO_3)) and remineralization rate of small detritusN(SDeRRN) are conducted.The results demonstrate that the biogeochemical model is quite sensitive to the zooplankton grazing parameter when it ranges from 0.1 to 1.2 d~(-1).The K_(NO_3) and SDeRRN also play an important role in determining the nitrogen cycle within certain ranges.The sensitive interval of KNO_3 is from 0.1 to 1.5(mmol/m~3)~(-1),and interval of SEdRRN is from 0.01 and 0.1 d~(-1).The observational data from September 1998 to July 2000 obtained at SEATS station are used to validate the performance of biological model after parameters optimization.The results show that the modified model has a good capacity to reveal the biological process features,and the sensitivity analysis can save computational resources greatly during the model simulation. 相似文献
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本文在构建黄海浒苔漂移输运模型的基础上耦合了生长消亡过程的生态模块,利用CFSR(Climate Forecast System Reanalysis)再分析数据、国家海洋环境预报中心全球业务化海洋学预报系统(Chinese Global operational Oceanography Forecasting System,CGOFS)黄东海再分析数据和CFS(Climate Forecast System products)预报数据,结合国家卫星海洋应用中心黄海绿潮遥感资料,选取浒苔灾害在时空动态演变过程方面存在明显差异的2016年和2019年,开展了黄海浒苔漂移输运和生长消亡过程的数值模拟,进行敏感实验和年度预测检验。结果表明,该模型可以有效刻画2016年黄海浒苔发展趋势的显著特征,对浒苔的漂移路径、影响范围和相对生物量变化特征的数值模拟结果与监测实况较为吻合。在2019年的年度预测应用上,针对浒苔漂移输运路径的方向、影响海域的时间、生物量较往年的变化等方面,模拟效果也都比较理想,体现出该模型在实际业务化预报应用中的可靠性和有效性。 相似文献
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本文聚焦盆地结构和新层系研究, 基于最新采集的航空重磁综合测量数据和岩石样本物性数据, 结合重点地区井震资料, 对异常数据进行多尺度构造分层, 构建了松辽盆地中北部浅—中—深三维空间结构格架; 通过定性与定量研究, 系统分析了研究区上白垩统底面、中生界底面、磁性基底顶面等深度以及上白垩统、上侏罗统—下白垩统、上古生界等厚度, 为研究区域上古生界、上侏罗统—下白垩统等含油气新层系、探讨盆地结构特征对油气的控制作用提供地球物理证据。研究结果表明, 研究区不同地段的上古生界残留厚度差异性显著, 厚度变化范围在0~9300 m之间, 西部和北东部残留厚度较大, 北部和东部局部缺失; 上侏罗统—下白垩统厚度和埋藏深度在研究区北、南部明显不同, 总体呈现南部较厚而且埋藏较深北部较薄而且局部缺失的特征。 相似文献
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近日,河南省地矿局地勘一院与中国地质科学院矿产资源研究所在桐柏县银洞坡金矿危机矿山深部找矿项目取得重大进展,预测新增金金属量近21吨,续作项目已通过专家评审. 相似文献