Trend analysis of weather parameters over Indian Sundarbans

Authors

  • UTTAM KUMAR MANDAL ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • DIBYENDU BIKAS NAYAK ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • SOURAV MULLICK ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • ARPAN SAMUI ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • AMIT KUMAR JANA ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • K.K. MAHANTA ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • SHISHIR RAUT ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • SHIVAJI ROY ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India
  • D. BURMAN ICAR-Central Soil Salinity Research Institute, Regional Research Station, Canning Town, West Bengal-743329, India

DOI:

https://doi.org/10.54386/jam.v21i3.253

Keywords:

Coastal region, climate change, trend analysis, Mann-Kendall test, Canning

Abstract

Sundarbans in West Bengal of India by virtue of its strategic location in the Eastern coast on the Bay of Bengal falls in one of the most vulnerable zones of abrupt climate change. Temporal trends of weather parameters of Canning Town (22o18'10.8'' N Latitude, 88o39'58.4'' E Longitude, elevation 3.52 m msl) representing Indian Sundarbans were analysed by non-parametric Mann-Kendall test and Sen's slope approaches. Analysis of long term rainfall data (1966-2015) indicated that Canning receives a mean annual rainfall of 1821 mm (±341.8 mm) with a considerable variation (CV = 18.8%). The results revealed that total annual rainfall trend decreased non-signicantly at the rate of 0.94 mm yr-1. On an average 84.4 rainy days in a year was recorded in the region, whereas during last ten years (2006-2015), the number of rainy days was reduced to 79.7 days yr-1. There was no signicant change in maximum, minimum and mean temperature of the region. Bright sunshine hours declined signicantly at an annual rate of 0.055 hr yr-1. Reference crop evapotranspiration (ET ) calculated using FAO Penman-Monteith method revealed that annual ET signicantly decreased at the rate of 5.98 mm yr-1. There was 2.7 times surplus rainfall than  crop evapotranspiration during monsoon months indicating very high scope of water harvesting to tackle water logging during the monsoon season and unavailability of fresh water for irrigation during lean season.

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Published

01-09-2019

How to Cite

UTTAM KUMAR MANDAL, DIBYENDU BIKAS NAYAK, SOURAV MULLICK, ARPAN SAMUI, AMIT KUMAR JANA, K.K. MAHANTA, SHISHIR RAUT, SHIVAJI ROY, & D. BURMAN. (2019). Trend analysis of weather parameters over Indian Sundarbans. Journal of Agrometeorology, 21(3), 307–615. https://doi.org/10.54386/jam.v21i3.253

Issue

Vol. 21 No. 3 (2019): September

Section

Research Paper

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