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

[00:24 . 14]本项目的目的是发展一系列测量方法，为副热带北大西洋经向海洋热通量提供长期、可持续的监测系统。目标是提供热通量和经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。这一目标不同于更成熟的方法，即利用高分辨率地带性跨盆地水文剖面来估计不规则间隔的热通量，但它是互补的。需要定期的估计来确定变化的幅度和主要的时间尺度，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”。在时间上间隔很宽的跨盆地剖面的变化。提议的计划是PI之间的合作努力。英国南安普顿海洋学中心的研究人员接受了国家环境研究委员会快速气候变化（Rapid）项目的资助。美国对拟议的现场观测系统的贡献包括以下要素：佛罗里达海流监测使用操作海底电缆，每周船载声学多普勒海流Pro？1 .从志愿观测船获取的ADCP横截面，以及每季度的水文/下ADCP剖面。连续系泊时间序列测量横跨深西部边界流（DWBC）和安的列斯海流地区的巴哈马东部，包括半年水文/低adcp部分。重复（季度）高分辨率志愿观测船XBT部分横跨大西洋从直布罗陀到迈阿密，在“AX7”线上。该项目的这一组成部分将从2004年冬季开始实施要素(2)的系泊部分，为期四年，并以更深入的XBT补充要素(3)，作为对气候变率和可预测性（CLIVAR）计划的贡献。英国将支持跨盆地的水文巡航和沿着26.5？N，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.