The study collected water samples from three rivers in southern Taiwan to understand the temporal and spatial variations of major dissolved ions, including Na+, K+, Mg2+, Ca2+, Cl-, SO42-, HCO3- and H4SiO4, and to explore the relationships between chemical and physical weathering in an orogenic and tropical area. During 2006-2007, total dissolved solid discharge (TDS discharge) from the investigated rivers was calculated to be around 3.27 Mt/yr, and 60 % of dissolved ions were attributable to the outcrop of silicate. However, TDS discharge occupied just 3 % of total delivered material in the river water. Accordingly, physical transport plays a decisive role in weathering process with only a small fraction capable of going through chemical dissolution in reaching the river. The investigation results also show that the huge amount of water discharge in rainy seasons dilute ion concentrations, and that sea spray delivered by monsoon and compositions or properties of source rocks also induce spatial variations of dissolved ions. Additionally, areas with low strength rock have more dissolved material in the river water.
|Number of pages||5|
|Publication status||Published - 2013 Jan 1|
All Science Journal Classification (ASJC) codes
- Earth and Planetary Sciences(all)