{"refrec":{"BRefID":16035,"RR":"<b>van Haren, J.J.M.; Joordens, J.C.A.</b> (1990). Observations of physical and biological parameters at the transition between the southern and central North Sea. <i>Neth. J. Sea Res. 25(3)</i>: 351-364","BEntID":16035,"PublicFlag":1,"CheckedFlag":0,"wosflag":null,"vabbflag":null,"RefStringPartII":". <i>Neth. J. Sea Res. 25(3)</i>: 351-364","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"van Haren, J.J.M.; Joordens, J.C.A.","OrigTitleTranslFlag":0,"Authorstringtrunc":"van Haren, J.J.M.; Joordens, J.C.A.","Englishabstract":"In the area between the 30 and 40 m isobaths, just north of the Netherlands, a transition from Channel water to central North Sea water is found. Observations obtained in May and June 1986 show a predominantly along-isobath directed sub-tidal current. In the vertical cross-isobath plane a quasi-permanent upwelling zone overlying the steepest bottom slope is inferred from observed cross-isobath currents. In the same area Creutzberg (1985) observed a persistent chlorophyll <i>a</i> (chl <i>a</i>) maximum. Our observations show a chl <i>a</i> maximum extending from the bottom towards the pycnocline over a larger area in cross-isobath direction and with larger amounts of chl <i>a</i> than found by Creutzberg(1985). This chl <i>a</i> maximum is found above a zone of large amounts of benthic particulate organic carbon. The observed chl <i>a</i> distributions are compared with current and density observations via an advection-diffusion equation. Only rough estimates of the terms in this equation are obtained, which indicates that a balance between vertical advection and mixing, <i>i.e.</i> local generation, is most probable. 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