Engineering topics
Yung, Yuk
Publications and source records attributed to Yung, Yuk.
MISR Winds Along the Equator During Five El Nino and Four La Nina Events in 2000-2016
No abstract available
Atmospheric OH Response to the 11-year Solar Cycle and Implications for Ozone
No abstract available
AIRS Retrieval of Atmospheric CO2 in Three Layers (Progress Toward Satellite Retrieval of a Profile)
No abstract available
Reaching for the Middle Strat and Lower Trop for AIRS CO2 (Progress Toward Satellite Retrieval of a Profile)
No abstract available
Middle Strat (25km) and Lower Trop (2.2km) CO2 from AIRS (Progress Toward Satellite Retrieval of a Profile)
No abstract available
AIRS CO2 Retrievals Using the Method of Vanishing Partial Derivatives (VPD)
This document consists of presentation slides that review the work being done with observations from the Atmospheric Infrared Sounder (AIRS) using the concept of Vanishing Partial Derivatives. The infrared region is where several minor gases such as CO2, O3, CO, CH4 and SO2 are radiatively active.
Does The Nile Reflect Solar Variability?
Historical records of the Nile water level provide a unique opportunity to investigate the possibility that solar variability influences the Earth's climate. Particularly important are the annual records of the water level, which are uninterrupted for the years 622-1470 A.D. These records are non-stationary, so that standard spectral analyses cannot adequately characterize them. Here the Empirical Mode Decomposition technique, which is designed to deal with nonstationary, nonlinear time series, becomes useful. It allows the identification of two characteristic time scales in the water level data that can be linked to solar variability: the 88 year period and a time scale of about 200 years. These time scales are also present in the concurrent aurora data. Auroras are driven by coronal mass ejections and the rate of auroras is an excellent proxy for solar variability. Analysis of auroral data contemporaneous with the Nile data shows peaks at 88 years and about 200 years. This suggests a physical link between solar variability and the low frequency variations of the Nile water level. The link involves the influence of solar variability on the North Annual Mode of atmospheric variability and its North Atlantic and Indian Oceans patterns that affect rainfall over Eastern Equatorial Africa where the Nile originates.