U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

AstroCalc4R : software to calculate solar zenith angle; time at sunrise, local noon, and sunset; and photosynthetically available radiation based on date, time, and location

Supporting Files


Details

  • Personal Author:
    Jacobson, Lawrence D. ; Seaver, Alan ; Tang, Jiashen
  • Corporate Authors:
    Northeast Fisheries Science Center (U.S.)
  • NOAA Program & Office:
    NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center)
  • Description:
    "AstroCalc4R for Windows and Linux can be used to study diel and seasonal patterns in biological organisms and ecosystems due to illumination. The algorithms require more time to understand and program than would be available to most biological researchers. In contrast to the algorithms, the results are understandable and links to marine and terrestrial ecosystems are obvious to biologists. Diel variation in solar energy affects the energy budgets of ecosystems (Link et al. 2006) and behavior of a wide range of organisms including zooplankton, fish, marine birds, reptiles and mammals; and aquatic and terrestrial organisms (e.g. Hjellvik et al. 2001). The solar zenith angle; time at sunrise, local noon and sunset; and photosynthetically available radiation (PAR) are the most important variables for biology that are calculated by AstroCalc4R. PAR is the amount of photosynthetically available radiation (usually wavelengths of 400-700 nm) at the surface of the earth or ocean based on the solar zenith angle under average atmospheric conditions"--Summary.
  • Content Notes:
    by Larry Jacobson, Alan Seaver, and Jiashen Tang.

    "August 2011."

    Includes bibliographical references (page 5) and endnotes.

    Jacobson L, Seaver A, Tang J. 2011. AstroCalc4R: software to calculate solar zenith angle; time at sunrise, local noon and sunset; and photosynthetically available radiation based on date, time and location. US Dept Commer, Northeast Fish Sci Cent Ref Doc. 11-14; 10 p.
  • Series:
    Northeast Fisheries Science Center reference document 11-14
  • Document Type:
    Reference Document
  • Place as Subject:
    United States
  • Rights Information:
    Public Domain
  • Compliance:
    Library
  • Download URL:
    https://repository.library.noaa.gov/view/noaa/3867/noaa_3867_DS1.pdf
  • File Type:
    Filetype[PDF - 402.61 KB]
  • Collection(s):
    National Marine Fisheries Service (NMFS)
  • Main Document Checksum:
    urn:sha-512:e55ce396a32deeb65325b53f47a310160af0d4d8b0c24ba97d74a1fee15b3df04a05f641bccff11c8197c15cc27e2e1b546a6aae82f225f645fdc3dac23786f3

Supporting Files

PREVIOUS
ON THIS PAGE
Details Supporting Files
 Found an issue?
Send us an email at:
noaa.repository@noaa.gov
The NOAA IR serves as an archival repository of NOAA-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by NOAA or funded partners. As a repository, the NOAA IR retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP