Spectral definition of the macro-algae Ulva curvata in the back-barrier bays of the Eastern Shore of Virginia, USA
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Abstract
We have developed methods to determine the visible (VIS) to near-infrared (NIR) spectral properties of thalli and epiphytes of bloom-forming and green macrophyte Ulva curvata in back-barrier lagoons in Virginia, USA. A 2% increase in NIR thalli reflectance from winter to summer (ca. 9.5%) matched the drop in summer NIR transmittance (ca. 90%). In contrast, summer and winter VIS reflectance (reaching 6%) were nearly identical while winter transmittance (ca. 85%) was 10–20% higher. NIR absorption remained at 5% but VIS absorption increased by 10–20% from winter to summer. Replicate consistency substantiated the high transmittance difference indicating thallus composition changed from summer to winter. Epiphytes increased thallus reflectance (<ca. 4%) and decreased transmittance (<ca. 10%) and exhibited broadband VIS and NIR absorptions in summer and selective peaks in winter. A simulation coupling water extinction with thallus reflectance and transmittance found seven submerged thalli maximized the surface reflectance enhancement (ca. 2.5%).
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Spectral definition of the macro-algae Ulva curvata in the back-barrier bays of the Eastern Shore of Virginia, USA |
| Series title | International Journal of Remote Sensing |
| DOI | 10.1080/01431161.2010.543436 |
| Volume | 33 |
| Issue | 2 |
| Year Published | 2012 |
| Language | English |
| Publisher | Taylor & Francis |
| Contributing office(s) | Wetland and Aquatic Research Center |
| Description | 18 p. |
| First page | 586 |
| Last page | 603 |
| Google Analytic Metrics | Metrics page |