相关实验视频

Updated: Jun 12, 2025

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Investigating the Relationship between Sea Surface Chlorophyll and Major Features of the South China Sea with Satellite Information

Published on: June 13, 2020

在过去的千年中,南美季风的加剧是由太平洋和大西洋联合强迫驱动的

Zhiqiang Lyu¹, Mathias Vuille¹, Hugues Goosse²

¹Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, USA.

Science advances

|September 20, 2024

概括

南美夏季季风 (SASM) 从中世纪的气候异常加剧到小冰河时代. 这项研究使用古气候数据同化重建了SASM变异性,改善了气候模型预测.

科学领域:

古气候学古气候学
气候动力学气候动力学
南美气候南美气候

背景情况:

南美夏季季风 (SASM) 显著影响南美热带地区的气候.
了解SASM的长期变异性,特别是在中世纪气候异常 (MCA) 和小冰河时代 (LIA) 中,一直很困难,数据相互矛盾.
之前使用气候模型和氧同位素的研究对SASM变化产生了不一致的结果.

研究的目的:

以高分辨率重建过去一千年 (LM) 热带南美洲的水气候.
解决之前关于MCA-LIA过渡期间SASM变异性的调查结果中的差异.
为该地区提供动态连贯和完整的古气候记录.

主要方法:

采用古气候数据同化 (DA) 方法.
综合气候模型输出与氧气同位素 (δ¹⁸O) 观测.
开发了在5年分辨率下为LM进行 δ18 O 支持的水气候重建.

主要成果:

为南美洲热带地区在LM上进行了全面的南方夏季水气候重建.
根据独立的水气候和 δ¹⁸O记录验证了重建.
在MCA-LIA过渡时期,揭示了SASM在百年规模上的强化.

结论:

SASM的强化与大西洋热带融合区向南转移有关,并加强了太平洋步行者循环 (PWC).
在气候模型中准确地表示PWC对于预测未来SASM变化至关重要.
该研究提供了一个可靠的古气候数据集,以了解SASM动态.

更多相关视频

Using Generative Art to Convey Past and Future Climate Transitions

Using Generative Art to Convey Past and Future Climate Transitions

Published on: March 31, 2023

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

Published on: June 8, 2015

相关概念视频

Global Climate Change

Global Climate Change

Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.

Precipitation Processes

Precipitation Processes

The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...

Precipitation and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Variation of Atmospheric Pressure

Variation of Atmospheric Pressure

Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...

What is Climate?

What is Climate?

Climate refers to the prevailing weather conditions in a specific area over an extended period. As the saying goes, “Climate is what you expect. Weather is what you get.” Climate is influenced by geographic factors, such as latitude, terrain, and proximity to bodies of water.

Coriolis Force

Coriolis Force

An accelerating particle experiences a force equal to the mass multiplied by the acceleration in an inertial frame of reference. Consider a particle in a non-inertial frame of reference, such as a sliding ball on a rotating table. The acceleration of the ball in this rotating reference frame is different than in the intertial frame, which modifies its equation of motion. The fictitious forces acting additionally on a rotating frame of reference alter Newton's Second Law expression.