ABSTRACT
Tides in the Arctic Ocean affect ocean circulation and mixing, and sea ice dynamics and thermodynamics. However, there is a limited network of available in situ tidal coefficient data for understanding tidal variability in the Arctic Ocean; e.g., the global TICON-3 database contains only 111 sites above 60°N and 21 above 70°N. At the same time, the presence of sea ice and latitude limits of satellite altimetry complicate altimetry-based retrievals of Arctic tidal coefficients. This leads to a reliance on ocean tide models whose accuracy depend on having sufficient in situ data for validation and assimilation. Here, we present a comprehensive new dataset of tidal constituents in the Arctic region, combining analyses of in situ measurements from tide gauges, ocean bottom pressure sensors and GNSS interferometric reflectometry. The new dataset contains 914 measurement sites above 60°N and 399 above 70°N, with each site being quality-assessed and expert guidance provided to help maximise the usage of the dataset. We also compare the dataset to recent tide models.
ABSTRACT
A prospective randomized trial of simple closure versus closure and proximal gastric vagotomy was conducted in 50 consecutive patients with perforated duodenal ulcer. There was one postoperative death in each group and no difference in postoperative morbidity. After a median follow-up of 54 months (24-96) the cumulative recurrence rate after simple suture was 52 per cent against 16 per cent after proximal gastric vagotomy and closure (P less than 0.01). The recurrence rate after proximal gastric vagotomy for perforated duodenal ulcer was comparable to the recurrence rate seen after the electively performed operation.
