Do the local tide measurement data support or contradict the global satellite data?
A. The tide measurement data contradict the satellite data because the tide meas
are decreasing.
B. The tide measurement data support the satellite data because the number of F
can be ignored.
C. The tide measurement data contradict the satellite data because the number o
increasing local sea level trends.
D. The tide measurement data support the satellite data because the tide measur
is significantly greater than the number of decreasing local sea level trends.
The Correct Answer and Explanation is :
The correct answer is:
C. The tide measurement data contradict the satellite data because the number of increasing local sea level trends.
Explanation:
Tide measurement data and satellite data are both crucial tools for studying sea level trends, but they come from different sources and have different methodologies.
Tide Measurement Data: These are typically collected from tide gauges along coastlines. They are reliable for measuring relative sea level (RSL) changes at specific locations over time. However, they can be influenced by local factors such as land subsidence (the gradual sinking of the land), ocean currents, and weather patterns. As a result, tide gauges may show a mix of rising and falling sea levels, especially at regional scales.
Satellite Data: Satellites, particularly those using radar altimetry, measure the height of the sea surface over vast areas of the globe. These measurements help to observe global sea level trends, providing a broader and more consistent view of the Earth’s oceans. Satellites are generally less affected by local factors and offer a better representation of global sea level rise.
Why C is Correct:
The question suggests that there is a contradiction between local tide measurement data and global satellite data. This contradiction arises when tide gauges show increasing local sea level trends (due to regional factors like glacial melt or thermal expansion in specific areas), but satellite data shows more consistent global trends of rising sea levels.
Global satellite data tends to show an overall increase in sea level due to global warming, but locally, sea levels may appear to rise faster in certain areas due to regional warming, while other areas may experience local variations, such as land sinking. If the tide measurement data shows an increase in local sea levels in several areas, but satellite data shows a global trend, it highlights regional discrepancies, suggesting a contradiction between the two data sources.
In contrast, options A, B, and D do not adequately capture this regional discrepancy. They either misinterpret the role of local trends, or incorrectly suggest that the tide measurements support the satellite data without accounting for regional differences.