Unser Doktorand Xing Yi aus der Abteilung Einflüsse und Auswirkungen auf Küstengebiete des Instituts für Küstenforschung wurde eingeladen, im Rahmen des Geologisch-Biogeochemischen Seminars der Universität Hamburg einen Seminarvortrag zu seiner Forschung zu halten. Xing Yi ist Doktorand im Exzellenzcluster „Integrated Climate System Analysis and Prediction“ – CliSAP – und arbeitet dort in Topic 3B „Marine and Coastal Systems“.
Details zum Vortrag
Wann: 2. Juni 2015, 16:15 Uhr
Wo: Geomatikum Hörsaal H6, Bundesstraße 55, Hamburg
Titel des Vortrags: „The relationship between Arabian Sea upwelling and Indian Monsoon revisited“
In this study, we aim to characterize the large-scale climate forcings that drive upwelling along the western Arabian Sea coast. Studies based on ocean sediments suggest that there is a link between this coastal upwelling system and the Indian summer monsoon. However, a more direct method is needed to examine the influence of various forcings on upwelling. For this purpose, we analyze a high-resolution (~10 km) global ocean simulation (denoted STORM) over the period 1950-2010. We compare the simulated upwelling velocity with two traditional upwelling indices: along-shore wind speed and sea surface temperature. The analysis reveals good consistency between these variables, with high correlations between coastal upwelling and along-shore wind speed as well as coastal sea surface temperature. To study the impact of the monsoon on the upwelling we analyze both temporal and spatial co-variability between upwelling velocity and the Indian summer monsoon index. The spatial analysis shows that the impact of the monsoon on the upwelling is concentrated along the coast, as expected. However, somewhat unexpectedly, the temporal correlation between the coastal upwelling and the monsoon index is rather weak. Also, the spatial structure of upwelling in the Arabian Sea as revealed by a Principal Component Analysis is rather rich, indicating that factors other than the Monsoon are also important drivers of upwelling. In addition, no detectable trend in our coastal upwelling is found in the simulation that would match the prediction of a strengthening of upwelling under anthropogenic radiative forcing.
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