Measurements of the Diurnal Warm Layer and Biologically-Induced Heating during the CIRENE Campaign

CIRENE 活动期间昼夜暖层和生物诱发加热的测量

• 批准号: 0629707
• 负责人: Chester Grosch
• 金额: --
• 依托单位: Old Dominion University Research Foundation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-04-01 至 2010-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0629707&HistoricalAwards=false
• 关键词: Measurements; Diurnal; Warm; Layer; Biologically

Atmospheric convection in the Indian Ocean has a strong impact on the monsoon. During winter, the maximum amplitude of convection is located between the equator and 20 S, and is generally referred to as the Madden-Julian oscillation (MJO). Recent studies based on satellite data have shown that the intraseasonal activity in this region is associated with large sea surface temperature (SST) variability (up to 3 C), and it has been suggested that air-sea interaction plays an important role. Heretofore there have been only satellite data and numerical modelling used to investigate the variability in these regions. It is proposed to participate in a French Campaign the objective of which is to understand ocean-atmosphere coupling at the intraseasonal timescale in this region of the Indian Ocean, and to explain the mechanisms of the SST variability and its influence on the atmospheric evolution. Measurements will be made using the Air-Sea Interaction Profiler (ASIP), augmented with 5 Lagrangian floats, with 24-node temperature chains attached. ASIP, previsouly funded by the NSF Oceanographic Technology program, will provide profiles of temperature, conductivity, shear, fluorescence/turbidity, and PAR over the full depth of the mixed layer at sub-centimeter spatial resolution and repeat intervals of 5 minutes. This proposal will address the following fundamental problems: 1. the relative importance of local SST conditions and the diurnal cycle of the warm layer versus large scale atmospheric conditions 2. the biological contribution to heat trapping in the near-surface layer, and its role in the overall heat budget. The broader impacts of the objectives relate to climate change by addressing some of the issues pertinent to atmospheric convection in the Indian Ocean; the MJO interacts with the El Nino-Southern Oscillation, the monsoons, and extratropical weather, and therefore of global importance.

印度洋的大气对流对季风有很强的影响。冬季，对流最大振幅位于赤道至20S之间，通常称为马登-朱利安振荡（MJO）。最近基于卫星数据的研究表明，该地区的季节内活动与大的海面温度（SST）变化（高达3℃）有关，并且表明海气相互作用发挥着重要作用。迄今为止，仅使用卫星数据和数值模型来研究这些地区的变化。建议参加法国的一项运动，其目的是了解印度洋该地区季节内时间尺度的海洋-大气耦合，并解释海温变化的机制及其对大气演化的影响。测量将使用气海相互作用剖面仪 (ASIP) 进行，该剖面仪配有 5 个拉格朗日浮子，并附有 24 节点温度链。 ASIP 先前由 NSF 海洋学技术计划资助，将以亚厘米空间分辨率和 5 分钟的重复间隔提供整个混合层深度的温度、电导率、剪切力、荧光/浊度和 PAR 剖面。该提案将解决以下基本问题： 1. 当地海温条件和暖层昼夜循环与大尺度大气条件的相对重要性 2. 近地表层热量捕获的生物贡献及其在总体热量收支中的作用。通过解决与印度洋大气对流有关的一些问题，这些目标的更广泛影响与气候变化有关； MJO 与厄尔尼诺-南方涛动、季风和温带天气相互作用，因此具有全球重要性。