Mahanty Madan M, Latha G, Venkatesan R, Ravichandran M, Atmanand M A, Thirunavukarasu A, Raguraman G
National Institute of Ocean Technology, Ministry of Earth Sciences, Chennai, India.
National Centre for Polar and Ocean Research, Ministry of Earth Sciences, Goa, India.
Sci Rep. 2020 Sep 29;10(1):16047. doi: 10.1038/s41598-020-72917-4.
Over a 4-year period between 2015 and 2019, in-situ time series measurements of ocean ambient noise over the frequency range 100 Hz to 10 kHz, by an autonomous passive acoustic monitoring system have been made in the Kongsfjorden, Svalbard, Arctic. We characterize the noise due to sea ice melting during winter (December-January). This unique observation reveals loud noise signatures, of the order of 8 dB higher than the background noise, showing the signature of sea ice melting. Such observations are crucial for monitoring sea ice melting, especially during winter, to understand the recent warming of Arctic waters. The anomalous air temperature due to local atmospheric forcing and warming of ocean temperature in the fjord through ocean tunneling, individually or combinedly, is responsible for such sea ice melting. The cyclonic events in the Arctic are responsible for the anomalous atmospheric and ocean conditions, causing sea ice melting in winter.
在2015年至2019年的4年期间，利用一个自主式被动声学监测系统，在北极斯瓦尔巴群岛的孔斯峡湾对100赫兹至10千赫频率范围内的海洋环境噪声进行了原位时间序列测量。我们对冬季（12月至1月）海冰融化产生的噪声进行了特征描述。这一独特观测揭示了比背景噪声高出约8分贝的强烈噪声特征，显示出海冰融化的特征。此类观测对于监测海冰融化至关重要，尤其是在冬季，有助于了解北极水域近期的变暖情况。峡湾中由于局部大气强迫导致的异常气温以及通过海洋通道导致的海洋温度升高，单独或共同作用，是造成此类海冰融化的原因。北极的气旋事件导致了异常的大气和海洋状况，致使冬季海冰融化。
