Tropical Indian Ocean and East African seasonality during the Holocene: orbital forcing and ocean atmosphere interactions. (IndoOrb)
全新世热带印度洋和东非季节性:轨道强迫和海洋大气相互作用。
基本信息
- 批准号:260218773
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2015
- 资助国家:德国
- 起止时间:2014-12-31 至 2019-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
East African rainfall has declined significantly over recent decades, culminating in the extreme drought of 2010-2011 at the Horn of Africa. Instrumental and proxy data suggest that the tropical Indian Ocean has a primary influence on the long-term drying trend of East Africa. Of particular importance for East African rainfall is the warming of the so-called Seychelles-Chagos thermocline ridge (SCTR) located in the south-central Indian Ocean. The SCTR features a shallow thermocline and high mean sea surface temperatures (>28°C), allowing strong ocean-atmosphere interactions on various time scales. This project investigates (I) intraseasonal and interannual ocean-atmosphere interactions in the SCTR region, (II) their response to changes in orbital parameters during the Holocene and (III) their impact on rainfall variability in East Africa. As the instrumental data is very limited in time, I will use geochemical proxy data from modern and fossil corals to address these problems. I have chosen the following approach: (I) the corals will be sampled at weekly to bi-weekly resolution. This is necessary to capture intraseasonal events. (II) In the SCTR region, proxies that capture surface ocean parameters (Sr/Ca and stable oxygen isotopes: sea-surface-temperature and salinity) are coupled with proxies that record the nutrient content of surface waters (stable nitrogen isotopes). The latter is related to upwelling and thermocline variability. (III) Corals from East Africa are used to reconstruct river runoff using Ba/Ca and skeletal luminescence. The project focuses on orbital time scales. During the Holocene, changes in orbital parameters led to changes in seasonality that are comparable to interannual anomalies of the seasonal cycle observed today. For example, in the SCTR region positive Indian Ocean Dipole events cause a warming in September-November. Model data suggest that this is coupled with a deepening of the thermocline and reduced upwelling of nutrient-rich waters. In East Africa, rainfall is above average. During the mid-Holocene (6kyr BP), insolation in the SCTR region peaks in September-November (6 kyr BP). How does this affect upwelling in the SCTR region, and what is the rainfall response in East Africa? The processes observed on orbital time scales may allow a better understanding of the dynamical relationship between ocean-atmosphere interactions and external forcing in the Indian Ocean sector. This should provide important constraints on the response of the Indian Ocean to global warming.
近几十年来,东非降雨量大幅下降,最终导致2010-2011年非洲之角发生极端干旱。仪器和代用数据表明,热带印度洋对东非的长期干旱趋势具有主要影响。对东非降雨特别重要的是位于印度洋中南部的所谓塞舌尔-查戈斯温跃层脊的变暖。SCTR具有浅温跃层和高平均海面温度(>28°C),允许在各种时间尺度上强烈的海洋-大气相互作用。该项目调查(一)SCTR区域的季节内和年际海洋-大气相互作用,(二)它们对全新世期间轨道参数变化的反应,(三)它们对东非降雨量变化的影响。由于仪器数据在时间上非常有限,我将使用现代和化石珊瑚的地球化学代用数据来解决这些问题。我选择了以下方法:(I)每周至每两周对珊瑚进行采样。这是捕捉季节内事件所必需的。(II)在南太平洋热带地区,记录表层海洋参数(Sr/Ca和稳定氧同位素:海面温度和盐度)的代用指标与记录表层沃茨营养物含量的代用指标(稳定氮同位素)相结合。后者与上升流和温跃层变化有关。(III)来自东非的珊瑚被用来重建河流径流使用Ba/Ca和骨骼发光。该项目侧重于轨道时间尺度。在全新世,轨道参数的变化导致了季节性的变化,与今天观察到的季节性周期的年际异常相当。例如,在SCTR区域,正印度洋偶极子事件导致9月至11月的变暖。模型数据表明,这与温跃层加深和富营养沃茨上涌减少有关。在东非,降雨量高于平均水平。在全新世中期(6 kyr BP),SCTR地区的日照在9月至11月达到峰值(6 kyr BP)。这如何影响SCTR地区的上升流,东非的降雨反应是什么?在轨道时间尺度上观察到的过程可能有助于更好地了解印度洋部分海洋-大气相互作用与外部强迫之间的动力学关系。这将对印度洋应对全球变暖的反应提供重要的限制。
项目成果
期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Reef‐Scale‐Dependent Response of Massive Porites Corals From the Central Indian Ocean to Prolonged Thermal Stress: Evidence From Coral Sr/Ca Measurements
中印度洋大型滨珊瑚对长期热应力的 ReefâScaleâ 依赖性响应:来自珊瑚 Sr/Ca 测量的证据
- DOI:10.1029/2018gc007796
- 发表时间:2019
- 期刊:
- 影响因子:3.7
- 作者:Leupold;M. Pfeiffer;D. Garbe‐Schönberg;C. Sheppard
- 通讯作者:C. Sheppard
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
数据更新时间:{{ journalArticles.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ monograph.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ sciAawards.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ conferencePapers.updateTime }}
{{ item.title }}
- 作者:
{{ item.author }}
数据更新时间:{{ patent.updateTime }}
Professorin Dr. Miriam Pfeiffer其他文献
Professorin Dr. Miriam Pfeiffer的其他文献
{{
item.title }}
{{ item.translation_title }}
- DOI:
{{ item.doi }} - 发表时间:
{{ item.publish_year }} - 期刊:
- 影响因子:{{ item.factor }}
- 作者:
{{ item.authors }} - 通讯作者:
{{ item.author }}
{{ truncateString('Professorin Dr. Miriam Pfeiffer', 18)}}的其他基金
Orbital forcing, ocean-atmosphere interactions and nutrient dynamics in the Indian Ocean from the mid-Holocene until the present day
全新世中期至今印度洋的轨道强迫、海洋-大气相互作用和营养动态
- 批准号:
260218665 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Heisenberg Fellowships
Assessing the role of the Indian Ocean in global climate change: A paleoperspective
评估印度洋在全球气候变化中的作用:苍白的视角
- 批准号:
39931928 - 财政年份:2007
- 资助金额:
-- - 项目类别:
Research Grants
Indian Ocean warming from the peak of the Little Ice Age to the 21st century: Zanzibar Island, Western Indian Ocean (IndOC-W)
从小冰期高峰期到 21 世纪印度洋变暖:西印度洋桑给巴尔岛 (IndOC-W)
- 批准号:
468545267 - 财政年份:
- 资助金额:
-- - 项目类别:
Priority Programmes
相似国自然基金
肠道菌群代谢产物格拉司琼上调Indian Hedgehog减轻肠缺血再灌注损伤的作用及机制
- 批准号:82002088
- 批准年份:2020
- 资助金额:24.0 万元
- 项目类别:青年科学基金项目
Wnt/CTNNB激活Indian Hedgehog通路加速肝脏再生的机制研究
- 批准号:LQ21H030012
- 批准年份:2020
- 资助金额:0.0 万元
- 项目类别:省市级项目
Indian Hedgehog 在腰椎软骨终板退变和异常钙化中的作用机制和靶向治疗的研究
- 批准号:81572207
- 批准年份:2015
- 资助金额:57.0 万元
- 项目类别:面上项目
Indian hedgehog基因敲除优化种子细胞生物力学及其在组织工程软骨构建中的作用
- 批准号:31340010
- 批准年份:2013
- 资助金额:15.0 万元
- 项目类别:专项基金项目
特异性抑制Indian Hedgehog信号传导通路治疗软骨肉瘤的实验研究
- 批准号:81072189
- 批准年份:2010
- 资助金额:36.0 万元
- 项目类别:面上项目
相似海外基金
Acoustic Detection of Rainfall using Ocean Gliders in the Tropical Indian Ocean
使用海洋滑翔机对热带印度洋降雨量进行声学探测
- 批准号:
2274334 - 财政年份:2019
- 资助金额:
-- - 项目类别:
Studentship
Tropical radiolarian biostratigraphy during the Neogene in the central Indian Ocean and eastern equatorial Pacific
印度洋中部和赤道东太平洋新近纪热带放射虫生物地层学
- 批准号:
18K03819 - 财政年份:2018
- 资助金额:
-- - 项目类别:
Grant-in-Aid for Scientific Research (C)
Surface Mixed Layer Salinity Budget in the Tropical Indian Ocean
热带印度洋表面混合层盐度收支
- 批准号:
1558331 - 财政年份:2016
- 资助金额:
-- - 项目类别:
Standard Grant
Coupled Processes that Determine the Basic States of Tropical Indian Ocean SeaSurface-Temperature (SST) and Asian Monsoon Precipitation
确定热带印度洋海面温度(SST)和亚洲季风降水基本状态的耦合过程
- 批准号:
1460742 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Standard Grant
Reconstruction of PALeo-sea water properties in the tropical western Indian Ocean for the last 470 kyrs using Mg/Ca and stable isotopes on planktonic foraminifera: atmospheric versus oceanographic influences (PALIO).
使用 Mg/Ca 和浮游有孔虫稳定同位素重建过去 470 kyr 热带西印度洋的 PALeo 海水特性:大气与海洋影响 (PALIO)。
- 批准号:
271447497 - 财政年份:2015
- 资助金额:
-- - 项目类别:
Research Grants
Early Grant in Exploratory Research: Acquisition and analysis of sediment cores from the eastern tropical Indian Ocean
探索性研究的早期资助:东热带印度洋沉积物岩心的采集和分析
- 批准号:
1400860 - 财政年份:2013
- 资助金额:
-- - 项目类别:
Standard Grant
Mechanisms and Effects of Tropical Indian Ocean Variability
热带印度洋变化的机制和影响
- 批准号:
1305719 - 财政年份:2012
- 资助金额:
-- - 项目类别:
Standard Grant
Collaborative Research: Dropsonde Measurements for Characterizing Lower Troposphere Moisture Variability and Air-sea Interaction over the Tropical Indian Ocean
合作研究:用于表征热带印度洋上空对流层低层湿度变化和海气相互作用的下投探空仪测量
- 批准号:
1062300 - 财政年份:2011
- 资助金额:
-- - 项目类别:
Interagency Agreement
Collaborative Research: Dropsonde Measurements for Characterizing Lower Troposphere Moisture Variability and Air-sea Interaction over the Tropical Indian Ocean
合作研究:用于表征热带印度洋上空对流层低层湿度变化和海气相互作用的下投探空仪测量
- 批准号:
1062242 - 财政年份:2011
- 资助金额:
-- - 项目类别:
Continuing Grant
Stability analysis of the western boundary currents in the tropical Indian Ocean
热带印度洋西边界流的稳定性分析
- 批准号:
0927472 - 财政年份:2010
- 资助金额:
-- - 项目类别:
Standard Grant