Regular readers know that I use only in situ measurements from the World Ocean Database (WOD) that have been placed into the "CTD" and "PFL" datasets, and that I use both 'O' (random depth) and 'S' (standard depth) categories therein.
Recently I mentioned changing my conversion settings to only use individual measurements in the WOD that have been given a zero errors setting (out of 0-9) by the WOD handlers (A New Way of Analyzing The Depths - 4).
Further, I have put quality restrictions of my own on the qualities of those measurements.
II. The "Layer" Approach
In this series I have intended to follow latitude oriented layers from the Equator north into the Northern Hemisphere, and south into the Southern Hemisphere (see last graph showing the area in red outline).
Today's posts feature Layer Zero through Layer Eight, which covers the Northern Hemisphere.
The day of year format "DOY" is used on all graphs.
III. Other Formats To Come
The month and year formats for these zones will be presented in graphs in soon-to-come posts.
They will be covering the same nine layers.
They will be in formats that use the exact same temperature and salinity data.
Nevertheless, they will be able to present a different, but revealing picture.
I have been pleased with how much it helps to present the exact same data in three ways as I said before.
IV. Why Am I Doing This?
I have written that one of the reasons is to revisit the hypothesis that "thermal expansion is the main cause of sea level rise" in the 19th and 20th centuries.
|World Ocean Database Zones (layers L0-L8)|
The bathtub model as it applies to sea level change is a non-starter (The Bathtub Model Doesn't Hold Water, 2, 3, 4).
The ocean layers, if the thermal expansion hypothesis had not been falsified in these multiple series of posts (Series Posts, SEA LEVEL), would show stable upward trend lines.
Instead, they show stable trend lines indicating IMO that the ninety some odd percent of heat being trapped by green house gases is going into the oceans and is then being relatively evenly distributed.
V. Exceptions To The Rule
The polar regions are out of form in that department, because they are unequally impacted (see e.g. Polar Sea Ice Trend At Both Poles, 2, 3, 4).
They are warming several times faster than the lower latitudes are (Live Science).
The graphs get a bit rugged at the poles (compare Layer Zero to Layer Eight).
The great ice sheets contain sufficient ice to raise sea level hundreds of feet, and they are now and have been the main source of sea level change.
The previous post in this series is here.