Subsidence critical factor in local sea level rise assessments

Abstract

This letter examines the interplay between anthropogenic subsidence and eustatic effects in shaping relative sea levels, focusing on New York City (NYC) as a primary case study and extending the analysis to Sydney (Australia), Alexandria (Egypt) and other coastal cities. We emphasize the necessity for comprehensive analyses that integrate both local and global factors to accurately understand and predict sea level trends. Highlighting the often-overlooked issue of subsidence, particularly in urbanized areas like Manhattan, the letter argues that neglecting this factor alongside eustatic changes can lead to inaccurate conclusions and inadequate coastal management strategies. The study's findings, supported by updated data and a broad literature review, are crucial for ocean and coastal management, informing effective mitigation and adaptation strategies, urban planning, risk assessment, policy formulation, and economic forecasting. By integrating both subsidence and eustatic effects, the letter advocates for a holistic approach to managing and addressing the multifaceted challenges of sea level rise, ultimately enhancing scientific and public awareness of the critical local and global factors at play.