3 czerwca @ 15:38
I would like to invite you to a seminar by Jullian Williams, the newly appointed Research Assistant at the Department of Polar and Marine Research. The seminar will take place on Wednesday, May 14th at 2pm in room 213.
Title:
Spatiotemporal analysis of Polar Sea Ice and Atmospheric pollution using Google Earth Engine
Abstract:
Google Earth Engine is a cloud computation resource for planetary-scale spatio-temporal analysis. It stores a variety of remote sensing datasets that can be used for climate change research. The ocean and atmosphere are parts of the planetary system, which includes sea ice and the cryosphere. This dissertation includes studies of the variability in time and space of polar sea-ice and of atmospheric pollution during the COVID-19 shutdown in different contexts. The advancement in machine learning techniques, satellite instrumentation and applied engineering applications, allows an improvement in our understanding of the changes in time series information related to these extreme environments. Our study in the Arctic determined that lead evolution and subsequent ice cover may be strongly influenced by meteorology and with increasing open water lead prevalence, in the increase of heat flux through the sea-air surface. In the Antarctic, we determine that the backscatter intensity of flooded ice is like thin ice cover (approximately -12 db).
The atmosphere shows stochastic and quasi-periodic changes in its composition due to natural drivers. However, anthropogenic influences also affect the concentration of compounds in the air, especially in major cities. The global shutdown during the COVID-19 pandemic reduced the volume of carbon-based compounds released in the air due to the reduction of traffic and building exhaust from slowdown of daily production routine. This study observes atmospheric concentrations before and after the global shutdown in March 2020 in major cities in Texas, USA and Wuhan, China.