کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4736642 1640907 2011 15 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structure and origin of Holocene cold events
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات زمین شناسی
پیش نمایش صفحه اول مقاله
Structure and origin of Holocene cold events
چکیده انگلیسی

The present interglacial, the Holocene, spans the period of the last 11,700 years. It has sustained the growth and development of modern society. The millennial-scale decreasing solar insolation in the Northern Hemisphere summer lead to Northern Hemisphere cooling, a southern shift of the Intertropical Convergence Zone (ITCZ) and a weakening of the Northern Hemisphere summer monsoon systems. On the multidecadal to multicentury-scale, periods of more stable and warmer climate were interrupted by several cold relapses, at least in the Northern Hemisphere extra-tropical area. Based on carefully selected 10,000-year-long time series of temperature and humidity/precipitation, as well as reconstructions of glacier advances, the spatiotemporal pattern of six cold relapses during the last 10,000 years was analysed and presented in form of a Holocene Climate Atlas (HOCLAT; see http://www.oeschger.unibe.ch/research/projects/holocene_atlas/). A clear cyclicity was not found, and the spatiotemporal variability of temperature and humidity/precipitation during the six specific cold events (8200, 6300, 4700, 2700, 1550 and 550 years BP) was very high. Different dynamical processes such as meltwater flux into the North Atlantic, low solar activity, explosive volcanic eruptions, and fluctuations of the thermohaline circulation likely played a major role. In addition, internal dynamics in the North Atlantic and Pacific area (including their complex interaction) were likely involved.


► Based on temperature, humidity and glacier data, we analyze Holocene cold events.
► During the Holocene a clear cyclicity between warm and cold periods was not found.
► Single cold relapses are subject to different dynamical processes.
► The six analyzed cold events show different spatial structures.
► A web-based Holocene Climate Atlas (HOCLAT) supplements the paper.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Quaternary Science Reviews - Volume 30, Issues 21–22, October 2011, Pages 3109–3123
نویسندگان
, , , , ,