surface ship  (Northwood Inc)

Journal: Proceedings of the National Academy of Sciences of the United States of America

Article Title: Cloud shadows drive vertical migrations of deep-dwelling marine life

doi: 10.1073/pnas.2022977118

Figure Lengend Snippet: ( A – G ) Selected daytime time series of the high-pass filtered anomalies of surface PAR o ' (black) and the DSL' (red). ( H – N ) The correlations ( r 2 ) versus time lag between PAR o ' and DSL'. In each case, the maximum correlation occurs when DSL' is lagged behind PAR o ' by ∼4 min (see Fig. 3 B ).

Article Snippet: This study utilizes three data types: 1) ship-mounted surface PAR o (Biospherical QSR-2200, SI Appendix , Fig. S2 A ), 2) acoustic backscatter (AB) intensity from the hull-mounted narrowband 150-kHz ADCP (RD Instruments, SI Appendix , Fig. S2 B ), and 3) profiles from a WW.

Techniques:

Journal: Proceedings of the National Academy of Sciences of the United States of America

Article Title: Cloud shadows drive vertical migrations of deep-dwelling marine life

doi: 10.1073/pnas.2022977118

Figure Lengend Snippet: Time series of ( A ) surface PAR o measured from the R/V Revelle and ( B ) PAR depth profile (PAR z ) measured from the WW (white space indicates regions where data were removed when the sensor measured below its noise floor of 1 μmol ⋅ m −2 ⋅ s −1 ). ( C ) WW PAR z profiles collected between 1000 and 1400 local time (gray points) were fit to estimate the light attenuation coefficient in the euphotic zone, k eu = 0.065 m −1 , with a 1% light level (horizontal dashed line), z eu , of 71 m occurring just below declines in the average Chl a fluorescence (blue line) and optical backscatter (red line). The average PAR predicted from the twilight zone light attenuation coefficient k tz = 0.03 m −1 is shown as a dashed black line. ( D ) Modeled PAR between 100 and 350 m. ( E ) AB' with isolumes (white contours) and the DSL (black lines). See also SI Appendix , Fig. S2 for the layers evident in the raw AB signal.

Article Snippet: This study utilizes three data types: 1) ship-mounted surface PAR o (Biospherical QSR-2200, SI Appendix , Fig. S2 A ), 2) acoustic backscatter (AB) intensity from the hull-mounted narrowband 150-kHz ADCP (RD Instruments, SI Appendix , Fig. S2 B ), and 3) profiles from a WW.

Techniques: Fluorescence