1 / 21

The Global Heat Budget

The Global Heat Budget. Air-sea exchanges of heat (& freshwater) create deep water masses & drive the conveyor belt Heat source into the ocean is solar radiation There are several heat loss terms latent, conduction, longwave radiation, reflected solar

alvis
Download Presentation

The Global Heat Budget

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. The Global Heat Budget • Air-sea exchanges of heat (& freshwater) create deep water masses & drive the conveyor belt • Heat source into the ocean is solar radiation • There are several heat loss terms latent, conduction, longwave radiation, reflected solar • Ocean circulation moves heat (advection)

  2. Solar Radiation

  3. Solar Radiation

  4. The Heat Budget Total heat flux (Qt) = Solar radiation (Qs) - Latent heat loss (Qe) - Conductive heat loss (Qh) - Longwave radiation (Qb) Qt = Qs - Qe - Qh - Qb

  5. Heat Loss Terms • Latent heat flux (Qe) • Energy required to evaporate water • Most important in tropics & midlatitudes • Conductive (or sensible) heat flux (Qh) • Loss to turbulent exchange with atmosphere • Typically small • Longwave radiation (Qb) • Net thermal IR emission from ocean

  6. Global Heat Budget

  7. Net Solar Radiation Typical Jan Tropics 200 W/m2 Mid-latitudes 100 W/m2 High-latitude ~10 W/m2

  8. Latent Heat Loss Typical Jan Tropics 120 W/m2 Mid-latitudes 100 W/m2 High-latitude ~20 W/m2

  9. Conductive Heat Loss Typical Jan Tropics 0-10 W/m2 Mid-latitudes 0-40 W/m2 High-latitude 0-30 W/m2

  10. Net Longwave Radiation Typical Jan Tropics 40-50 W/m2 Mid-latitudes 60-70 W/m2 High-latitude 30-50 W/m2

  11. Total Heat Flux Typical Jan Cool NH Heat - SH WBC’s -200 W/m2 SH Subtropics 70 W/m2 NH Subtropics > -80 W/m2

  12. Total Heat Flux Typical July Heat NH Cool SH NH Subtropics 100 W/m2 SH Subtropics -40 W/m2

  13. Global Heat Budget

  14. Global Heat Transport

  15. Global Heat Transport 1015 W = 1 Petawatt

  16. Hydrographic Inverse Models • WOCE hydrographic sections are used to estimate global circulation & material transport • Mass, heat, salt & other properties are conserved • Air-sea exchanges & removal processes are considered • Provides estimates of basin scale circulation, heat & freshwater transports

  17. Global Heat Transport World Ocean Circulation Experiment - WOCE

  18. Global Heat Transport

  19. Global Heat Transport

  20. Global Heat Transport

  21. The Global Heat Budget • Heat source into the ocean is solar radiation • There are several heat loss terms latent, conduction, longwave radiation, reflected solar • Ocean circulation moves heat (advection) • Large scale heat budget can be closed by analyzing hydrographic sections

More Related