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2 years ago in Biology , Plant Biophysics By Anuj Patel

How can chlorophyll readings in µmol/m² be converted to µg/cm²?

My PhD involves correlating satellite-derived vegetation indices with ground-truthed biochemical data. The mismatch in reported units for chlorophyll molar versus mass per areais creating inconsistencies in my calibration models. I need to establish a reliable conversion factor to integrate these datasets seamlessly for my regression analysis.

 

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By Prajwal Sharma Answered 1 year ago

In my work validating canopy-level sensors with leaf-level data, this is a common but critical step. First, you need the average molecular weight (MW) for chlorophyll a and b, which is approximately 893.5 g/mol. Your conversion formula is: µg/cm² = (µmol/m²) * (MW in µg/µmol) / 10,000. The divisor accounts for the area conversion from m² to cm². I have seen errors arise from using an incorrect MW or forgetting the area adjustment. I would recommend always stating the MW you used in your methods section for reproducibility. For precise work, consider if your sample's a:b ratio justifies using a specific weighted average.

 

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