Not sure if this one says what you think it says. This says that there is a dearth of peer reviewed papers published which dispute AGW because there's a dearth of scientists who dispute AGW.
Imho, that seems to work against you argument that there is some significant number of "anti-AGW" papers which are being kept our of journals.
As I mentioned before, the data you are looking for are, the submission/acceptance ratio for "pro-AGW" and "anti-AGW" papers. If the quality of the work is roughly equal, then the acceptance rates should be roughly equal. If the quality of work is roughly equal, but the submission/acceptance ratio is skewed such that "anti-AGW" papers have a much worse ratio, it would be strong evidence that there was some sort of non-scientific influence keeping these papers out of publication--which, if I understand you correctly, is the case you're making when you reference "gate-keepers."
But this article instead makes the case that the views of the climatology community are being accurately expressed in the journals. Afaict, that's pretty much the opposite of the case you're trying to make.
I would say that this article supports the idea that your assertion that the "gate-keepers" are preventing some significant number of "anti-AGW" papers from being published is not impossible.
Yet to get from "possible" to actual, we still have some hurdles to clear.
A prominent one is the actual data on the submission/acceptance ratios mentioned above. Just because it can be demonstrated that reviewers have biases, (sometimes personal petty ones as I noted and you discounted up thread), we still need to show that the bias claimed actually exists.
This article's findings could have resulted from a bias against newbies.
We still need to show that there is some non-scientific bias which is keeping "anti-AGW" papers from being published. Showing that reviewers can have biases, possibly against letting first time authors get off easy, isn't the same as showing that reviewers have a specific bias.
Fwiw, sometimes when a paper is rejected, the objections are forwarded to the author who has a chance to rebut or correct the paper and re-submit.
Isn't this pretty much a re-hashing of the objections and accusations which National Review now claims are not based on actual facts?
How many reviews have been done of the Climate-gate stuff? The court documents posted make a good case for that after multiple scientific reviews of the Climate-gate stuff that there is not really a there there.