Seminar by Prof. Raghu Murtugudde

Bio-Physical Interactions and Feedbacks in The Tropics

Tropical oceans offer an interesting contrast in their zonal and meridional dynamics and thermodynamics with interacting coupled climate modes. Much progress has been made in the dominant ENSO signal in terms of process and predictive understanding as well as ecosystem and biogeochemical responses and bio-physical feedbacks.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Prof. Dong-Kyu Lee

New observations of ageostrophic (Ekman and barotropic) current in the ocean

Most global circulation models reproduce density fields reasonably well, but show poor performance in ocean circulation fields. It indicates that the numerical models do not represent dynamics of the ageostrophic current, mainly Ekman current and/or barotropic current.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Henning A. Bauch

Transformation processes of submarine permafrost at the northern Siberian continental margin since the last glaciation

Major parts of the continental periphery of the Arctic Ocean is comprised of terrestrial permafrost. Empirical data as well as modeling experiments show that the stability of this particular cryosphere is under immense pressure due to global warming. However, during Quaternary times this frozen landscape was repeatedly changed due to fluctuations in both temperature and sea-level which particularly affected the wide and shallow North-Siberian shelves.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Yassir Eddebbar

Forced, Unforced, and Mesoscale Variability of Oceanic O2

Oxygen (O2) is critical to life at sea. Its distribution in the ocean’s interior reflects a subtle balance between physical (e.g. air-sea flux and transport) and biogeochemical (e.g. consumption at depth) processes. As the ocean warms further, its dissolved oxygen ([O2]) content is expected to decline as gas solubility decreases and ventilation weakens. Observations indicate indeed widespread [O2] losses in recent decades, with a pronounced decline in the tropical Pacific. Climate models, however, fail to reproduce the spatial patterns and magnitude of this decline.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Hannah Horowitz

Impacts of anthropogenic change on pollution and climate

Human activity impacts both sources of pollutants, as well as the chemical and physical processes determining the pathways from sources to societal impacts. In this talk I will focus on the mercury cycle as an example of the full biogeochemical cycle of a pollutant. Mercury (Hg) adversely affects human health on a global scale through fish consumption. It remains cycling in the ocean for decades to centuries, such that present-day and future environmental loadings are influenced by the past.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Jin-Soo Kim

Two-way Interactions between Terrestrial Ecosystem and Climate System

Better understanding of factors that control the global carbon cycle could increase confidence in climate projections. In this study, long-term simulations of the Earth system models (ESMs) in phase 5 of the Coupled Model Intercomparison Project archive were used to examine the interannual carbon flux variability associated with ENSO.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Gokhan Danabasoglu

Atlantic Meridional Overturning Circulation:
Low-Frequency Variability and Model Representation

The Atlantic meridional overturning circulation (AMOC) is thought to play a major role in decadal and longer time-scale climate variability as well as in prediction of the earth’s future climate on these time scales. However, because only rather short records of continuous observational estimates of AMOC transports are available at very limited locations and only for the recent period, support for such a prominent role for AMOC primarily comes from model simulations.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Mr. Ryohei Yamaguchi

Observed long-term trend and variability in global upper-ocean stratification

Many studies on future projections by climate models of the Coupled Model Intercomparison Project (CMIP) point out the long-term strengthening of the upper-ocean stratification due to the surface intensification of the ocean warming associated with global warming. The strengthened stratification will reduce vertical nutrient supply from the subsurface by more stabilizing the upper-ocean water column, and then the primary production of the whole ocean is concerned to decrease.

Jasmine - Seminar Room (1010), 10th floor, M Building

Seminar by Dr. Yun-Young Lee

Two Types of California Central Valley Summer Heat waves

Understanding the mechanisms of how Californian Central Valley (CCV) extreme heat waves develop is very important as the events have major impacts on the economy and human safety. This study diagnoses the temporal and spatial evolution as well as the thermodynamics and dynamics of Large Scale Meteorological Patterns (LSMPs) during extreme CCV heat waves.

Jasmine - Seminar Room (1010), 10th floor, M Building