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Analysis and modeling of decadal and long-term variability of coastal California summer temperature changes.

机译:加利福尼亚沿海夏季温度变化的年代际和长期变化的分析和建模。

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摘要

Summer average daily maximum temperature (Tmax) trends for 1950-2010 were calculated for 241 locations along all of California by use of daily max temperatures from NWS Coop sites to understand the spatial and temporal variabilities of the previously reported summer coastal-cooling. Results show that coastal-cooling appears almost continuously throughout the California coast in locations open to marine air penetrations for the period of 1970-2010. Correlations with the Pacific Decadal Oscillation (PDO) Index show that coastal-cooling disappears during the increasing PDO period (1950-1985).;The most influential factor(s) on California summer coastal temperatures, i.e., Greenhouse Gas (GHG) warming, PDO and changes in Land Cover/Land Use (LCLU), were determined through numerical atmospheric modeling using the Weather Research & Forecasting (WRF) model. Combined results from observations, reanalysis and modeling lead to the conclusion that PDO is the main mechanism of decadal variability of California summer temperatures, dominating over global GHG-warming effects. PDO affects both coastal and inland temperatures by controlling the position and intensity of the two dominating global circulation patterns on California summer: the semi-permanent Pacific High Pressure System and the continental Thermal-Low. Coastal cooling will rise on decreasing PDO periods, where the warming of inland regions and cooling of nearshore Sea Surface Temperatures (SSTs) results in an increase in sea-breeze activity. Coastal-warming results in increasing periods of the PDO. Global warming induced by GHG and hyper-urbanization were found to be major sources of coastal warming over complete PDO cycles (1950-2010).
机译:通过使用NWS Coop站点的每日最高气温,了解了先前报道的夏季沿海降温的时空变化,计算了整个加利福尼亚州241个地点的1950-2010年夏季平均每日最高气温(Tmax)趋势。结果表明,在1970年至2010年期间,整个加利福尼亚海岸的沿海降温几乎持续出现在向海洋空气渗透的地方。与太平洋年代际涛动指数(PDO)的相关性表明,在PDO不断增加的时期(1950-1985年),沿海降温现象消失了;对加利福尼亚夏季沿海温度影响最大的因素是温室气体(GHG)变暖, PDO和土地覆盖/土地利用(LCLU)的变化是通过使用天气研究与预报(WRF)模型通过大气数值模拟确定的。来自观察,重新分析和建模的综合结果得出结论,PDO是加利福尼亚夏季温度年代际变化的主要机制,主导了全球温室气体变暖效应。 PDO通过控制加利福尼亚夏季两种主要的全球环流模式的位置和强度来影响沿海和内陆的温度:半永久性的太平洋高压系统和大陆的低热区。沿海降温将随着PDO周期的减少而增加,内陆地区的变暖和近岸海表温度(SSTs)的冷却导致海风活动增加。沿海升温导致PDO周期增加。人们发现,由温室气体和过度城市化引起的全球变暖是整个PDO周期(1950-2010年)沿海变暖的主要来源。

著录项

  • 作者

    Sequera, Pedro.;

  • 作者单位

    The City College of New York.;

  • 授予单位 The City College of New York.;
  • 学科 Atmospheric sciences.;Environmental engineering.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 139 p.
  • 总页数 139
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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