New Zealand Sea Level Change

[GordMay]

Originally Posted by boatman61

Is sea level rising.. or is land level on certain plate edges sinking...

Both.

[boatman61]

Originally Posted by GordMay

Both.

I like a man who hedges his bets..

[Ryban]

People will keep their heads in the sand until their butts are on fire and their feet underwater.

Your meme pictures from your Facebook feed are not valid arguments. It's content catered to you by algorithms because you see it as irreputable "evidence" for your subjective beliefs. What you've cherry picked isn't even data, it's just a photo with no context other than meme text.

https://earthobservatory.nasa.gov/im...sea-level-rise

It's fine though. Your picture of a lighthouse is better evidence than satellites in orbit with sophisticated equipment purpose-made to measure sea level.

[GordMay]

➚ Exactly backwards➚*.

How would sea level change if all glaciers [ice over land] melted?
Global sea level would rise approximately 70 meters (approximately 230 feet), flooding every coastal city on the planet.
But, fortunately, that's not going to happen.


At the North Pole, the ice floats on the Arctic Ocean. If it melted, sea levels would not be affected, at all.

* But there might be a less dramatic reason, than polar ice melting, for the higher ocean level -- the higher temperature of the water.
Water is most dense at 4 degrees Celsius. Above and below this temperature, the density of water decreases [the same weight of water occupies a bigger space].
So as the overall temperature of the water increases it naturally expands a little bit making the oceans rise.

[AKA-None]

Originally Posted by boatman61

Is sea level rising.. or is land level on certain plate edges sinking...

Pretty certain that isn’t an or
So does anyone think that the continental plate movement can cause large scale vertical changes over a large horizontal scale in the timeframe we see?

[S/V Illusion]

Originally Posted by Ryban

People will keep their heads in the sand until their butts are on fire and their feet underwater.

Your meme pictures from your Facebook feed are not valid arguments. It's content catered to you by algorithms because you see it as irreputable "evidence" for your subjective beliefs. What you've cherry picked isn't even data, it's just a photo with no context other than meme text.

https://earthobservatory.nasa.gov/im...sea-level-rise

It's fine though. Your picture of a lighthouse is better evidence than satellites in orbit with sophisticated equipment purpose-made to measure sea level.

There is an old saying - "science doesn't care what you think".

Read the qualifying comments in your link(s), all of which describe why precise predictions and projections are difficult and imprecise judgments based on perceptions of whomever is making the judgment.
Conversely, historical photographs, e.g. Sydney Harbor over the past 140 years, don't depend on judgment, predictions or perceptions. Why so many seem to willingly ignore the reality is startling.

[GordMay]

Originally Posted by chubby

...but would you consider the past performance IS useful in decision making for future?
(of course you would...and do) ...

One way to approach the question, is to study how sea level changed in the past.
Earth is nearly as warm now, as it was during the last interglacial period, about 125,000 years ago.
At that time, sea level was 4 to 6 meters (13-20 feet) higher. It seems that this higher sea level was due to the melting Greenland and West Antarctic ice caps.

[Ryban]

Originally Posted by S/V Illusion

There is an old saying - "science doesn't care what you think".

Read the qualifying comments in your link(s), all of which describe why precise predictions and projections are difficult and imprecise judgments based on perceptions of whomever is making the judgment.
Conversely, historical photographs, e.g. Sydney Harbor over the past 140 years, don't depend on judgment, predictions or perceptions. Why so many seem to willingly ignore the reality is startling.

You say it's difficult to measure sea level precisely, so ignore the NASA data, and yet you use a picture of a light house has your yard-stick.

You haven't provided anything scientific in defense of your statement. You provided a photo of a lighthouse at two different points in time, with no real way to discern sea level, and with no context for what the tides were between the two photos.

But if I were to play-along and take your photo at face value like you want us to, then clearly the sea level has risen more than 0cm. Just look at the photo. It's refutable.

[boatman61]

Originally Posted by AKA-None

Pretty certain that isn’t an or
So does anyone think that the continental plate movement can cause large scale vertical changes over a large horizontal scale in the timeframe we see?

Well, the Pacific plate, which includes much of the South Island, is moving relative to the Australian plate at a rate of about 40 millimetres each year in a southwesterly direction. So Christchurch is moving away from Auckland about 4 metres every century.
By logic some vertical movement is as viable as a horizontal one.

[chubby]

Originally Posted by Ryban

People will keep their heads in the sand until their butts are on fire and their feet underwater.

Your meme pictures from your Facebook feed are not valid arguments. It's content catered to you by algorithms because you see it as irreputable "evidence" for your subjective beliefs. What you've cherry picked isn't even data, it's just a photo with no context other than meme text.

https://earthobservatory.nasa.gov/im...sea-level-rise

It's fine though. Your picture of a lighthouse is better evidence than satellites in orbit with sophisticated equipment purpose-made to measure sea level.

arguments for(or against) what exactly?


i(personally) only am simply stating there is no need to fear...
(and in a roundabout way...to think for yourself. ie stop regurgitating programing from the evening news)



i do not doubt that our climate does change..
it does....and it always has (it is normal)

our frozen brothers in the north have to deal with 4 seasons after all.


i will state climate change is not caused by "man".
that is BS...and silly.
...and frankly, i am incapable to call BS anything anything except BS if BS is what it is.



we have el niño and la niña and multiple ice ages and indian summers and who knows what "seasons" our sun goes thru in a cycle..
again the "changes" are "normal"... there is no need to scare people.



:-)






the "seasons" will come and changes will happen regardless of how often you intentionally drive your prius slow in passing lanes or however many carbon credits buy every year....

[Ryban]

Originally Posted by boatman61

Well, the Pacific plate, which includes much of the South Island, is moving relative to the Australian plate at a rate of about 40 millimetres each year in a southwesterly direction. So Christchurch is moving away from Auckland about 4 metres every century.
By logic some vertical movement is as viable as a horizontal one.

This line of reasoning though requires us to accept an explanation that it's more likely the continents are moving upward for reasons we don't understand, than for sea level to be rising for reasons that we do understand.

More importantly though, satellite data indicates that sea-level is rising more or less globally across the ocean surface, so we'd also have to accept that entire crust is pushing outward at a pretty alarming rate. Additionally, we can also use the same methods to measure the rise and fall of continents, and I don't believe we're seeing a correspond change in the land masses.

https://earthobservatory.nasa.gov/im...cean-altimetry

[Ryban]

Originally Posted by chubby

arguments for(or against)
i(personally) only am simply stating there is no need to fear...
(and in a roundabout way...to think for yourself. ie stop regurgitating programing from the evening news)

There are plenty of reasons to be concerned, and you probably should be too. Unless you're of an age where the consequences will not affect you, then that's fine for you. But I would like to live the rest of my (hopefully) long life in a prosperous world full of diversity, and those things are not compatible with the current status quo.

Sea level rise is not the biggest concern with climate change, but it's the topic of this thread so we'll leave at that.

[CrispyCringle]

Im sure the photos of shoreline at different times takes into account the tides, right? Right?? You see what you want to see.

[Ryban]

Here's the best part. The lighthouse photographed is Fort Dension in Sydney Harbour.

Here's tidal gauge data for that exact location over the last century:
https://tidesandcurrents.noaa.gov/sl...tml?id=680-140

It clearly shows an increasing trend in sea level at at a rate of 0.75mm/year on average, and 3" over the last 100 years. That's not a lot, but it's also not 0cm.

[jordanbigel]

Originally Posted by chubby

i will state climate change is not caused by "man".
that is BS...and silly.
...and frankly, i am incapable to call BS anything anything except BS if BS is what it is.

What a load of BS. Frankly.