@misc{ning2016gsda, author={Wenxin {Ning} and Jing {Tang} and Helena L {Filipsson}}, title={{Grain size distribution and sea level changes in G{\aa}sfj\"{a}rden fjord}}, year={2016}, doi={10.1594/PANGAEA.865211}, url={https://doi.org/10.1594/PANGAEA.865211}, note={Supplement to: Ning, W et al. (2016): Long-term coastal openness variation and its impact on sediment grain-size distribution: a case study from the Baltic Sea. Earth Surface Dynamics, 4, 773-780, https://doi.org/10.5194/esurf-4-773-2016}, abstract={We analysed long-term variations in grain-size distribution in sediments from G{\aa}sfj\"{a}rden, a fjord-like inlet on the south-west Baltic Sea, and explored potential drivers of the recorded changes in sediment grain-size data. Over the last 5.4 thousand years (ka), the relative sea level decreased 17 m in the study region, caused by isostatic land uplift. As a consequence, G{\aa}sfj\"{a}rden has been transformed from an open coastal setting into a semi-closed inlet surrounded on the east by numerous small islands. To quantitatively estimate the morphological changes in G{\aa}sfj\"{a}rden over the last 5.4 ka and to further link the changes to our grain-size data, a digital elevation model (DEM)-based openness index was calculated. In the period between 5.4 and 4.4 ka BP, the inlet was characterised by the largest openness index. During this interval, the highest sand contents ({\textasciitilde}0.4 {\%}) and silt/clay ratios ({\textasciitilde}0. 3) in the sediment sequence were recorded, indicating relatively high bottom water energy. After 4.4 ka BP, the average sand content was halved to {\textasciitilde}0.2 {\%} and the silt/clay ratios showed a significant decreasing trend over the last 4 ka. These changes are found to be associated with the gradual embayment of G{\aa}sfj\"{a}rden as represented in the openness index. The silt/clay ratios exhibited a delayed and slower change compared with the sand contents, which further suggest that finer particles are less sensitive to changes in hydrodynamic energy. Our DEM-based coastal openness index has proved to be a useful tool for interpreting the sedimentary grain-size record.}, type={data set}, publisher={PANGAEA} }