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利用陕西省延安市洛川植保站闪讯TM害虫远程实时监测系统记录的2017—2019年金纹细蛾数据和相应的洛川县气象站观测数据,分析苹果金纹细蛾发生趋势与气象要素的关系。结果表明：洛川县金纹细蛾主要影响时间从5月中下旬开始,至9月下旬结束,年内可出现3个影响高峰期;金纹细蛾每天05时开始活动,12时活动减弱,06—10时活动频繁。降水对金纹细蛾的数量有明显影响,降水越多,虫情越严重;气候干旱,成虫数量明显偏少;5月上旬后期及中旬降水对第一代成虫影响巨大,是影响成虫数量的关键时段。根据金纹细蛾发育起点温度和有效积温,可以预测洛川第1代成虫发生期,对指导苹果生产,及时防治虫害具有重要意义。 相似文献
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烟台市区煤气中毒气象要素分析及等级预报 总被引：7，自引：0，他引：7
文章根据1998-2001年烟台市区煤气中毒资料，统计分析了煤气中毒与气温、风、气压等气象要素的相互关系，利用多元回归方法建立了采暖期煤气中毒等级气象预报模型。 相似文献
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草温与露点温度对结露和结霜指示性分析 总被引：2，自引：0，他引：2
利用密云国家基准气候站和电白国家基准气候站2009—2010年自动站的观测记录和人工结露、结霜观测资料,以及平谷国家一般气象站2010年12月至2011年5月自动站的观测记录和天气现象自动化观测资料,分析了结露、结霜与地面气象要素关系。结果表明:诸多气象要素中,草温和草温与露点温度差对露或霜结成具有指示性作用;电白站95.0%结露发生在日最小草温与露点温度差<1.1℃时,密云站95.0%结露发生在日最小草温与露点温度差<1.2℃时,密云站95.0%结霜发生在日最小草温与露点温度差<1.3℃时;结露主要发生在最低草温0.5℃以上,从平谷站自动天气现象观测资料分析可以看出结露发生在0℃以上,结霜发生在0℃以下;很多情况,百叶箱高度上的空气中的水汽含量并未达到饱和,而贴地(或贴近地物)的空气中的水汽含量达到饱和;日最小草温与露点温度差<3.1℃时,电白、密云站不出现露、霜的比率分别是16.8%和11.7%;因土壤湿度南方比北方大,草温与露点温度差为正的比例南方较北方大。 相似文献
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根据四川省电力调度中心提供的成都市2000～2001两年逐时的电力负荷资料,运用相关分析和复相关分析等方法,研究了电力负荷的时间变化特征及与气温、湿度、风、云量的相关关系,得出冬夏两季电力负荷与这些气象要素尤其是气温有较好的相关关系;并通过提取气象电量的方法来建立电力负荷与气象要素初步的预报方程. 相似文献
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夏季不同下垫面气象要素的对比分析 总被引：5，自引：4，他引：5
对扎龙湿地生态气象站和齐齐哈尔自动气象站2004年6~8月的逐时气温、风速、相对湿度等观测资料进行统计分析,找出了不同下垫面的两站之间不同时次各气象要素的差异,指出两站风速、气温、露点温度、相对湿度、地面温度等的月平均值均存在差异,变化幅度及极值出现时间各有不同;下垫面差异只起到加强或缓和气象要素日变化幅度的作用。所得结果有助于深入了解扎龙湿地的天气变化规律,对未来扎龙湿地气象要素的精细预报以及湿地资源的开发、保护和管理有一定的参考意义。 相似文献
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利用1951-2001年逐月NCEP再分析高度场、风场资料，COADS海表温度资料及中国147个台站逐月降水资料，运用SVD分析、SVD与回归分析相结合等方法，研究了太平洋SSTA与中国夏季降水年代际变化的相互关系，发现热带西太平洋是影响中国华南降水年代际变化的关键区，1950年代-1970年代后期，该海域SSTA为正，对应中国长江以南地区的夏季降水偏多，而长江以北则偏少；1970年代以后反之；影响中国长江中下游地区及其两侧降水年代际变化的关键区在中纬中部北太平洋，1970年代后期-1990年代前期，该海域SSTA为负，对应长江中下游夏季降水偏多，其两侧降水偏少；影响中国东北降水年代际变化的关键区是低纬中太平洋，1970年代-1980年代前期，低纬中太平洋SSTA为负，与之对应，中国东北夏季降水偏少；1950年代～1960年代中期、1990年代前、中期则反之。进一步对太平洋SSTA年代际变化影响中国夏季降水年代际变化的可能机制作了初步的研究。 相似文献
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Based on the data(including radius of maximum winds) from the JTWC(Joint Typhoon Warning Center),the tropical cyclones(TCs) radii of the outermost closed isobar, TCs best tracks from Shanghai Typhoon Institute and the Black Body Temperature(TBB) of the Japanese geostationary meteorological satellite M1 TR IR1, and combining13 tropical cyclones which landed in China again after visiting the island of Taiwan during the period from 2001 to2010, we analyzed the relationship between the number of convective cores within TC circulation and the intensity of TC with the method of convective-stratiform technique(CST) and statistical and composite analysis. The results are shown as follows:(1) The number of convective cores in the entire TC circulation is well corresponding with the outer spiral rainbands and the density of convective cores in the inner core area increases(decreases) generally with increasing(decreasing) TC intensity. At the same time, the number of convective cores within the outer spiral rainbands is more than that within the inner core and does not change much with the TC intensity. However, the density of convective cores within the outer spiral rainbands is lower than that within the inner core.(2) The relationship described above is sensitive to landing location to some extent but not sensitive to the structure of TC.(3) The average value of TBB in the inner core area increases(decreases) generally with increasing(decreasing) of TC intensity, which is also sensitive to landing situation to some extent. At the same time, the average value of TBB within the outer spiral rainbands is close to that within the entire TC circulation, and both of them are more than that within the inner core. However, they do not reflect TC intensity change significantly.(4) The results of statistical composite based on convective cores and TBB are complementary with each other, so a combination of both can reflect the relationship between TC rainbands and TC intensity much better. 相似文献
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青藏高原地区地-气系统的辐射平衡特征 总被引：1，自引：0，他引：1
本文利用1982年8月—1983年7月青藏高原热源野外考察期间的Nimbus7卫星观测资料,分析了高原及其邻近地区行星反照率、大气顶的射出长波辐射和地-气系统辐射平衡的区域分布及季节变化特征以及它们对天气气候的影响。同时配合同期的地面辐射观测资料,讨论了卫星资料与地面实测资料间的相互关系,为探索卫星资料的应用等作了尝试。 相似文献
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Based on the precipitation data of Meiyu at 37 stations in the valleys of Yangtze and Huaihe
Rivers from 1954 to 2001, the temporal-spatial characteristics of Meiyu precipitation and their
relationships with the sea surface temperature in northern Pacific are investigated using such methods as
harmonic analysis, empirical orthogonal function (EOF), composite analysis and singular value
decomposition (SVD). The results show that the temporal evolution and spatial distribution of Meiyu
precipitation are not homogeneous in the Yangtze-Huaihe Rivers basins but with prominent inter-annual
and inter-decadal variabilities. The key region between the anomalies of Meiyu precipitation and the
monthly sea surface temperature anomalies (SSTA) lies in the west wind drift of North Pacific, which
influences the precipitation anomaly of Meiyu precipitation over a key period of time from January to
March in the same year. When the SST in the North Pacific west wind drift is warmer (colder) than
average during these months, Meiyu precipitation anomalously increases (decreases) in the concurrent year.
Results of SVD are consistent with those of composite analysis which pass the significance test of
Monte-Carlo at 0.05. 相似文献
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The daily precipitation data of 740 stations in China(1958–2001)and the daily upper air data of European Centre for Medium-Range Weather Forecasts reanalysis dataset(1958–2001)are used to define an East Asian summer monsoon(EASM)index based on dynamic and thermal factors.The index is used to represent the front(or leading edge)of EASM to describe and characterize the advance and retreat of EASM objectively.During 1958–2001,the EASM movement underwent three interdecadal abrupt shifts in 1965,1980 and 1994,respectively.During 1958–1964,the front primarily concentrated in South China and North China,while it stayed at the mid-and lower-Yangtze River for a short period.During 1965–1979,the front was located in South China and the lower reach of Yellow River for a long time.During 1980–1993,the time in which the front of EASM stayed at the mid-and lower-Yangtze River was much longer,but it settled in North China for just a short time.During 1994–2001,the front generally concentrated in the south of the mid-and lower-Yangtze River.The three interdecadal shifts of EASM directly resulted in rainfall anomalies,as well as frequent disasters of flood and drought in East China. 相似文献
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Based on the Typhoon Yearbook data (1980–2000), some wind-pressure fitting relationships
were established for different typhoon intensity at the different latitudes of the western North Pacific. As
shown in validations with the 2001-2005 data, the relationships (namely, those between minimum sea
level pressure (SLP) and maximum sustained wind near a typhoon center) are stable. They may be applied
to correct the overestimated typhoon wind speeds in earlier years (1950–1979). Statistical analysis
showed that the stronger the typhoon, the more stable this wind-pressure relationship is. Moreover, it is
more stable at the lower latitude belt (10°N–30°N). On the basis of this result, a methodology of
correcting typhoon’s wind speeds and frequency in these years was put forward, and the climatological
series were reconstructed of yearly total typhoon frequencies over the western North Pacific in 1950-1979
and indices were determined of destructive power of typhoons in the offshore regions of China. 相似文献
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华南前汛期起止日期的确定及降水年际变化特征分析 总被引：10，自引：0，他引：10
利用国家气候中心提供的华南地区74测站1957—2001年的逐日降水资料和NCEP/NCAR再分析资料,对华南前汛期雨季开始期与结束期的定义标准作了改进;研究了华南前汛期降水雨量、雨日的年际变化特征以及变化趋势的空间分布特征;用小波分析法分析华南前汛期降水的周期分布特征。分析结果发现：45年来前汛期开始期总体上呈现偏早趋势,而结束期具有偏晚的趋势,两者的年际变化十分显著;45年来华南全区总雨量、雨日呈正趋势变化,且两者的空间分布特征非常相似。华南前汛期内雨量、雨日总体上呈现增长趋势并且具有明显的年际变化特征,存在准2年、3～5年、6～8年的振荡周期。 相似文献