...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Spatial and temporal rainfall variability near the Amazon-Tapajos confluence
【24h】

Spatial and temporal rainfall variability near the Amazon-Tapajos confluence

机译：亚马逊-塔帕霍斯河合流附近的时空降雨变化

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Do the influences of river breezes or other mesoscale effects lead to a systematic river proximity bias in Amazon rainfall data? We analyzed rainfall for a network of 38 rain gauges located near the confluence of the Tapajos and Amazon rivers in the eastern Amazon Basin. Tipping bucket rain gauges worked adequately in the Amazon rainfall regime, but careful field calibration and comparison with collocated conventional rain gauges were essential to incorporate daily totals from our array into regional maps. Stations very near the large rivers miss the afternoon convective rain, as expected if a river breeze promotes subsidence over the river, but paradoxically, this deficiency is more than compensated by additional nocturnal rainfall at these locations. The NOAA Climate Prediction Center (CPC) Morphing technique (CMORPH) passive infrared inferred rainfall data do an adequate job of describing medium scale variability in this region, but some localized breeze effects are not resolved at 0.25 degrees resolution. For areas inland from the rivers, nocturnal rainfall contributes less than half of total precipitation. A large-scale rainfall increase just to the west of Santarem manifests itself locally as a 'tongue' of enhanced rain from along the wide area of open water at the Tapajos-Amazon confluence. The Amazon River breeze circulation affects rainfall more than does the Tapajos breeze, which moves contrary to the predominant wind. East of the riverbank, the effects of the Tapajos breeze extend only a few kilometers inland. Rainfall increases to the north of the Amazon, possibly the result of uplift over elevated terrain. Dry season rainfall increases by up to 30% going away from the Amazon River, as would be expected given breeze-induced subsidence over the river.
机译：微风或其他中尺度效应的影响是否导致亚马逊降雨数据中系统的河流邻近偏差？我们分析了38个雨量计网络的降雨量，这些雨量计位于亚马逊流域东部塔帕霍斯河和亚马逊河交汇处附近。倾翻式斗式雨量计在亚马逊地区的降雨制度中可以正常工作，但是仔细进行现场校准和与并置的常规雨量计进行比较对于将我们阵列中的每日总量纳入区域地图至关重要。大河流附近的气象站错过了下午的对流降雨，这是预期的，如果微风促进了河上的沉降，但是反而是，在这些地方，额外的夜间降雨可以弥补这一不足。 NOAA气候预测中心（CPC）变形技术（CMORPH）被动红外推断的降雨数据可以很好地描述该区域的中尺度变化，但在0.25度分辨率下无法解决某些局部的微风效应。对于河流内陆地区来说，夜间降雨贡献的降雨量不足总降雨量的一半。圣塔雷姆（Santarem）西部的大规模降雨增加在局部表现为Tapajos-Amazon汇合处宽阔水域的降雨增加的“舌头”。亚马逊河的微风循环对降雨的影响比塔帕约斯的微风对降雨的影响更大，后者与主要的风向相反。 Tapajos微风的影响在河岸以东仅向内陆延伸了几公里。亚马逊北部的降雨增加，这可能是高地上空抬升的结果。干旱季节，离开亚马逊河的降雨量最多增加30％，这是微风引起的河上沉陷所预期的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号