Sea level has a strong seasonal signal. The annual variability is less than the daily changes associated with tidal forcing in most locations, but still can be on the order of 5-10 cm (maximum values about 15 cm).
The causes of the seasonal fluctuations are mostly associated with seasonal changes in wind intensity and patterns, changes in temperature that ...
Is an iceberg the size of Delaware [6,451 square kilometers] actually remarkable, or something that just happens from time-to-time?
In March 2000 iceberg B-15 formed which was 11,000 sq. km. and 295 km long.
In October 1998 iceberg A-38 formed which was 6,900 sq. km.
A Delaware size iceberg would be the 3rd largest in the past 20 years.
The 1990 article The ...
Developing since 2014, the crack was projected in 2015 to lead to "the largest calving event since the 1980s," according to this report in The Cryosphere journal by glaciologists studying the region.
From 2010, "Overview of areal changes of the ice shelves on the Antarctic
Peninsula over the past 50 years" says that the largest break-up event in that period ...
Quoting Kelly Brunt, an ice scientist with NASA and at the University of Maryland, from What the Heck Is the Deal with This Weird, Square Iceberg? at LiveScience.com:
What makes this one a bit unusual is that it looks almost like a square,
which does not rhyme with anything in your suggested 1:4:9 ratio.
The article mentions the obvious
I found a natural-color image of the same area: 68.28 South, 60.47 East, North is up, resolution is 130m/px, which makes the whole image about 100 km x 100 km. Looking at the image i'd say that:
sea ice is water with pieces of ice in it,
the boundary between the two regions is clear water, probably caused by winds and currents moving the floating ice away ...
There have been rectangular tabular icebergs in the past so this is not uncommon at all.
Kelly Brunt, an ice scientist with NASA and the University of Maryland said:
Tabular icebergs form, she said, through a process that's a bit like a fingernail growing too long and cracking off at the end. They're often rectangular and geometric as a result
Is "Chasm One" an "official" name for the feature?
No. This is only an informal name used to designate a rift structure (fracture) in the Brunt Ice Shelf, East Antarctica. For example, another rift structure, which trends perpendicular to "Chasm 1," was informally named the "Halloween Crack" because it was first ...
In the Arctic there is mostly floating sea ice and the mass of this does not change the sea level.
When snow falls on the floating sea ice the weight of the snow is the same as the weight of the sea water it displaces so there will not be any change in sea level from this.
But the snow falling on land during winter is water temporary removed from the sea, ...