Gedser

For the first time. Wolf (1972) analyzed major Baltic inflows by means of a quantitative definition. To distinguish between regular inflows and MBIs, he suggested empirical criteria for their identification in the entrance area to the Baltic Sea using limiting values of stratification and bottom salinity at the 1/v Gedser Rev (GR) in the Darss Sill area ... 

On the basis of decadal means and maximum values of salinity measured at I/v Gedser Rev, Matthaus (1995) later identified 15 MBls between 1880 and 1896. 

With the aim of publication in this book, the gauge data of Gedser and Hornbaek from 1890 to 1972 were digitized and calibrated in cooperation between DMI, lOW, and BSH. Later data were provided digitally by DMI. 

The tide gauge in Gedser was estabhshed in 1891 and operational from January 1892, that in Hornbaek was established during the summer of 1890 and operational from September 1890 at the positions ofGedser at 54 °N 34, 11 °E56 andofHornbaekat56°N06, 12°E28. ... 

Gedser Float in stilling well from 1892. Differential pressure transducer — CTD... 

The sea-level difference between Hornbsk and Gedser and the related pressure gradient along the Danish Straits is a appropriate measure for the water exchange between the Kattegat and the Baltic Proper. In particular, it is the chief driving force for Major Baltic Inflow events, see Chapter 10. With the actual time series, an almost gap-free, continuous record of these events between 1891 and 2005 has become available, see Section 20.3.6. A total of 915 245 valid difference values are provided in the file Diff H G.asc. The mean difference is... 

FIGURE 20.10 Barotropic Transport Index Batrix in cm from 1891 to 2005, compiled from hourly sea-level differences between Hornbrek and Gedser (Section 20.3.3), filtered with the linear lOd-memory response function (Eq. 2.16). 

The ASCII file batrix.asc is the daily Barotropic Transport Index Batrix, compiled from hourly sea level differences between Hornbaek and Gedser (Section 20.3.3), filtered with the linear 10-day-memory response function (20.16) of the volume flow in reaction to the applied barotropic pressure gradient. The Batrix values are measured in cm and are taken at 24 h once a day. Data gaps are padded with the mean difference —4 cm. The Batrix time series shown in Fig. 20.10 is an alternative measure for the inflow activity during the last century. 

The file gedser rev.asc contains the daily measurements for the period 1897-1976 of the Danish light vessel Gedser Rev anchored at the positions given in Table 20.11. 

FIGURE 20.11 Surface salinity at Gedser Rev, low-pass filtered with an exponential response function with a memory of 10 days. The line at 17 psu indicates a threshold for significant barotropic inflow situations. 

Hansen, L., 2007. Hourly values of sea-level observations from two stations in Denmark. Hornbaek, 1890-2005 and Gedser, 1891-2005.Technical Report 07-09, Danish Meteorological Institute. www.dmi.dk/dmi/tr07-09.pdf (report), www.dmi.dk/dmi/tr07-09.zip (data). 

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