567 resultados para 2 cruises
Resumo:
Up to the end of the eighties the main source of deep water masses in the Ionian Basin was the southern Adriatic Sea. However, during the nineties a dramatic climatic change took place in the eastern Mediterranean Sea: the Eastern Mediterranean Transient (EMT). Since then, deep water has been formed by waters originating in the Aegean Sea. Expeditions carried out in this region in recent years indicate that the process of deep water formation might reverse again. To what extent this assumption applies and what characteristics the deep water in the Ionian Sea exhibit nowadays, should be determined on the cruise. The process of a re-reversal of abyssal water production in the Ionian Sea is a long-term process and must therfore be monitored for several years. Hence, this cruise is part of a series of cruises investigating this question (POS98, M71/3, MSM13/1-2, MSM15/4). The investigations were carried out by means of CTD/lADCP measurements.
Resumo:
Phycobiliproteins are a family of water-soluble pigment proteins that play an important role as accessory or antenna pigments and absorb in the green part of the light spectrum poorly used by chlorophyll a. The phycoerythrins (PEs) are one of four types of phycobiliproteins that are generally distinguished based on their absorption properties. As PEs are water soluble, they are generally not captured with conventional pigment analysis. Here we present a statistical model based on in situ measurements of three transatlantic cruises which allows us to derive relative PE concentration from standardized hyperspectral underwater radiance measurements (Lu). The model relies on Empirical Orthogonal Function (EOF) analysis of Lu spectra and, subsequently, a Generalized Linear Model with measured PE concentrations as the response variable and EOF loadings as predictor variables. The method is used to predict relative PE concentrations throughout the water column and to calculate integrated PE estimates based on those profiles.
