An Observing System for Meridional Heat Transport Variability in the Subtropical North Atlantic

0241438 JohnsThe项目的目标是开发一系列的测量，可以提供一个长期的，可持续的监测系统，在亚热带北大西洋的纬向海洋热通量。目标是提供对热通量和纬向翻转环流的连续估计，这些估计具有适当的精度，可用于探测与气候变化有关的重要趋势和变率。这个目标是不同的，但补充，更既定的方法，占据高分辨率的带状跨流域水文剖面，以估计在不规则的间隔热通量。需要定期的估计来确定变化的幅度和主导时间尺度，气候季节周期，并帮助过滤掉可能混淆长期热量测定的高频“噪音”。在时间上间隔很大的跨流域部分的ux变化。拟议的计划是PI之间的合作努力。美国对拟议的现场观测系统的贡献包括以下内容：1.佛罗里达目前监测使用的业务海底电缆，每周船上声学多普勒电流亲？从一艘志愿观测船获得的ADCP横截面，以及每季度一次的水文/低层ADCP横截面。横跨巴哈马以东的西部深海边界海流和安的列斯海流区域的连续系泊时间序列测量，包括每半年一次的水文/低位ADCP剖面。在“AX 7”线上，重复（每季度）对从直布罗陀到迈阿密的横跨大西洋的XBT船剖面进行高分辨率志愿观测。该项目的这一组成部分将从2004年冬季开始实施要素（2）的系泊组成部分，为期四年，并通过更深入地观测XBT来补充要素（3），作为对气候变化和可预测性（CLIVAR）计划的贡献。英国将支持跨流域水文巡航和沿沿着26.5的一系列剖面系泊？这将完成连续时间序列观测系统。

0241438 JohnsThe objective of this project is to develop a series of measurements that can provide a long-term, sustainable monitoring system for the meridional ocean heat flux in the subtropical North Atlantic. The goal is to provide continuous estimates of the heat flux and the meridional overturning circulation that are of suitable accuracy for detecting important trends and variability related to climate change. This goal is different from, but complementary to, the more established method of occupying high-resolution zonal trans-basin hydrographic sections to estimate the heat flux at irregular intervals. Regular estimates are needed to determine the magnitude and dominant time scales of variability, the climatological seasonal cycle, and to help filter out the higher frequency "noise" that may alias the determination of longer term heat ?ux variations from trans-basin sections that are widely spaced in time. The proposed program is a collaborative effort between the PI.'s and investigators from the Southampton Oceanography Centre in the United Kingdom who are funded as part of the Rapid Climate Change (RAPID) program of the National Environmental Research Council.The U.S. contribution to the proposed in-situ observation system consists of the following elements:1. Florida Current monitoring using the operational submarine cable, weekly shipboard Acoustic Doppler Current Pro?ler (ADCP) cross sections from a volunteer observing ship, and quarterly hydrographic/lowered-ADCP sections.2. Continuous moored time series measurements across the Deep Western Boundary Current (DWBC) and Antilles Current region east of the Bahamas, including semiannual hydrographic/lowered-ADCP sections.3. Repeated (quarterly) high-resolution volunteer observing ship XBT sections across the Atlantic from Gibraltar to Miami, on the "AX7" line.This component of the project will implement the moored component of element (2) for a four year period beginning in winter 2004, and to supplement element (3) with deeper reaching XBT's as a contribution to the CLImate VARiability and predictability (CLIVAR) program. The U.K. will support the trans-basin hydrographic cruises and an array of profiling moorings along 26.5?N that will complete the continuous time series observing system.