Office of Applied Research and Innovation - College of the North Atlantic

Dr. Ranjan Patro

Dr. Patro has been a researcher and administrator at College of the North Atlantic since 2002. Prior to that, he worked at Memorial University of Newfoundland, St. John’s and the University of California, Santa Barbara. Dr. Patro completed his doctoral studies at the National University of Ireland, Galway, and his undergraduate and master’s studies at Berhampur University, India. His research interests include air-sea gas exchange, bubble hydrodynamics, breaking waves, hydrocarbon gas seepage, bubble visualization, modeling, acoustics and mineral processing. His research findings have been widely applied to modeling of gas transfer in climatology, aeration process in water quality management, and flotation cells in the mining and oil and gas industries. Dr. Patro has 23 years of national and international research experience and has published numerous articles in peer-reviewed journals, as well as chapters in peer-reviewed books. He is currently developing an acoustic sensor for bubble measurement in flotation cells for the mining industry.

Journal Publications

Harunur Rashid, Zhaowu Zhang, David J.W. Piper, Ranjan Patro, Yunping Xu, Impact of Medieval Climate Anomaly and Little Ice Age on the Labrador Current flow speed and the AMOC reconstructed by the sediment dynamics and biomarker proxies, Palaeogeography, Palaeoclimatology, Palaeoecology, 2023, 111558, ISSN 0031-0182, https://doi.org/10.1016/j.palaeo.2023.111558

Abstract: It is widely accepted that the changes in freshwater transport into the Labrador Sea occurred during the Medieval Climate Anomaly (MCA) and Little Ice Age (LIA), which were instrumental in modifying the climate surrounding the North Atlantic. However, the extent to which paleo proxies accurately reflect freshwater transport is poorly known due simply to lack of data. This study provides the first direct proxy record of freshwater supply by the sediment dynamics sortable silt proxy for the past 1.45 ka. A sediment core MO2009061–0217 (46.387°N, 46.742°W) retrieved off the SE Grand Banks along the flow path of the Labrador Current was used to determine the sortable silt and extract lipid biomarkers. The sortable silt data were converted to current speed (cm/s), which suggests that the Labrador Current was weak during the MCA and most vigorous during the LIA. One concurrent water column temperature proxy, namely TEX86 based on glycerol dialkyl glycerol tetraethers (GDGTs), shows that the outer Labrador Current water was cooler during the LIA than the MCA. In contrast, the converse temperature changes were recorded along the inner Labrador Current, where temperature change was slight. Our data are placed with a few high-resolution (i.e., multi-decadal) published temperature data to reflect broader changes in the subpolar northwestern Atlantic. The temperature variations on the SE Grand Banks are analogous to those between northern Iceland and Greenland shelves over this period and reflect changes in the subpolar gyre geometry of the North Atlantic. We hypothesize that the heterogenous temperatures coupled to changes in the Labrador Current flow speed were modulated by subpolar ocean currents on the SE Grand Banks. Keywords: Sortable silt; Glycerol dialkyl glycerol tetraethers (GDGTs); Medieval Climate Anomaly; Little Ice Age; Labrador Current

Ranjan Patro

College of the North Atlantic's Prince Philip Drive Campus

Dr. Ranjan Patro

Journal Publications